@stdlib/array/complex64/README.md

Arrays.

<!--

@license Apache-2.0

Copyright (c) 2018 The Stdlib Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-->

# Complex64Array

> 64-bit complex number array.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="usage">

## Usage

```javascript
var Complex64Array = require( '@stdlib/array/complex64' );
```

<a name="constructor"></a>

#### Complex64Array()

Creates a 64-bit complex number array.

```javascript
var arr = new Complex64Array();
// returns <Complex64Array>
```

#### Complex64Array( length )

Creates a 64-bit complex number array having a specified `length`.

```javascript
var arr = new Complex64Array( 10 );
// returns <Complex64Array>

var len = arr.length;
// returns 10
```

#### Complex64Array( complexarray )

Creates a 64-bit complex number array from another complex number array.

```javascript
var arr1 = new Complex64Array( [ 1.0, -1.0, 2.0, -2.0 ] ); // [ re, im, re, im ]
// returns <Complex64Array>

var arr2 = new Complex64Array( arr1 );
// returns <Complex64Array>

var len = arr2.length;
// returns 2
```

#### Complex64Array( typedarray )

Creates a 64-bit complex number array from a [typed array][@stdlib/array/typed] containing interleaved real and imaginary components.

```javascript
var Float32Array = require( '@stdlib/array/float32' );

var buf = new Float32Array( [ 1.0, -1.0, 2.0, -2.0 ] ); // [ re, im, re, im ]
// returns <Float32Array>[ 1.0, -1.0, 2.0, -2.0 ]

var arr = new Complex64Array( buf );
// returns <Complex64Array>

var len = arr.length;
// returns 2
```

#### Complex64Array( obj )

Creates a 64-bit complex number array from an array-like object or iterable.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

// From an array of interleaved real and imaginary components:
var arr1 = new Complex64Array( [ 1.0, -1.0, 2.0, -2.0 ] );
// returns <Complex64Array>

var len = arr1.length;
// returns 2

// From an array containing complex numbers:
var buf = [ new Complex64( 1.0, -1.0 ), new Complex64( 2.0, -2.0 ) ];
var arr2 = new Complex64Array( buf );

len = arr2.length;
// returns 2
```

#### Complex64Array( buffer\[, byteOffset\[, length]] )

Returns a 64-bit complex number array view of an [`ArrayBuffer`][@stdlib/array/buffer].

```javascript
var ArrayBuffer = require( '@stdlib/array/buffer' );
var buf = new ArrayBuffer( 240 );

var arr1 = new Complex64Array( buf );
// returns <Complex64Array>

var len = arr1.length;
// returns 30

var arr2 = new Complex64Array( buf, 8 );
// returns <Complex64Array>

len = arr2.length;
// returns 29

var arr3 = new Complex64Array( buf, 8, 20 );
// returns <Complex64Array>

len = arr3.length;
// returns 20
```

* * *

### Properties

<a name="static-prop-bytes-per-element"></a>

#### Complex64Array.BYTES_PER_ELEMENT

Static property returning the size (in bytes) of each array element.

```javascript
var nbytes = Complex64Array.BYTES_PER_ELEMENT;
// returns 8
```

<a name="static-prop-name"></a>

#### Complex64Array.name

Static property returning the constructor name.

```javascript
var str = Complex64Array.name;
// returns 'Complex64Array'
```

<a name="prop-buffer"></a>

#### Complex64Array.prototype.buffer

Pointer to the underlying data buffer.

```javascript
var arr = new Complex64Array( 2 );
// returns <Complex64Array>

var buf = arr.buffer;
// returns <ArrayBuffer>
```

<a name="prop-byte-length"></a>

#### Complex64Array.prototype.byteLength

Size (in bytes) of the array.

```javascript
var arr = new Complex64Array( 10 );
// returns <Complex64Array>

var nbytes = arr.byteLength;
// returns 80
```

<a name="prop-byte-offset"></a>

#### Complex64Array.prototype.byteOffset

Offset (in bytes) of the array from the start of its underlying `ArrayBuffer`.

```javascript
var ArrayBuffer = require( '@stdlib/array/buffer' );

var arr = new Complex64Array( 10 );
// returns <Complex64Array>

var offset = arr.byteOffset;
// returns 0

var buf = new ArrayBuffer( 240 );
arr = new Complex64Array( buf, 64 );
// returns <Complex64Array>

offset = arr.byteOffset;
// returns 64
```

<a name="prop-bytes-per-element"></a>

#### Complex64Array.prototype.BYTES_PER_ELEMENT

Size (in bytes) of each array element.

```javascript
var arr = new Complex64Array( 10 );
// returns <Complex64Array>

var nbytes = arr.BYTES_PER_ELEMENT;
// returns 8
```

<a name="prop-length"></a>

#### Complex64Array.prototype.length

Number of array elements.

```javascript
var arr = new Complex64Array( 10 );
// returns <Complex64Array>

var len = arr.length;
// returns 10
```

* * *

### Methods

<a name="static-method-from"></a>

#### Complex64Array.from( src\[, clbk\[, thisArg]] )

Creates a new 64-bit complex number array from an array-like object or an iterable.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

// Create an array from interleaved real and imaginary components:
var arr = Complex64Array.from( [ 1.0, -1.0 ] );
// returns <Complex64Array>

var len = arr.length;
// returns 1

// Create an array from an array of complex numbers:
arr = Complex64Array.from( [ new Complex64( 1.0, -1.0 ) ] );
// returns <Complex64Array>

len = arr.length;
// returns 1
```

The iterator returned by an iterable must return either a complex number or an array-like object containing a real and imaginary component.

```javascript
var ITERATOR_SYMBOL = require( '@stdlib/symbol/iterator' );
var Float32Array = require( '@stdlib/array/float32' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var iter;
var arr;
var len;
var re;
var im;
var z;

// Define a function which returns an iterator protocol-compliant object...
function iterable() {
    var buf = new Float32Array( 2 );
    var i = 0;
    return {
        'next': next
    };

    function next() {
        i += 1;
        if ( i < 3 ) {
            // Reuse allocated memory...
            buf[ 0 ] = i;
            buf[ 1 ] = -i;
            return {
                'value': buf
            };
        }
        return {
            'done': true
        };
    }
}

if ( ITERATOR_SYMBOL === null ) {
    console.error( 'Environment does not support iterables.' );
} else {
    // Create an iterable:
    iter = {};
    iter[ ITERATOR_SYMBOL ] = iterable;

    // Generate a complex number array:
    arr = Complex64Array.from( iter );
    // returns <Complex64Array>

    len = arr.length;
    // returns 2

    z = arr.get( 0 );
    // returns <Complex64>

    re = realf( z );
    // returns 1.0

    im = imagf( z );
    // returns -1.0
}
```

To invoke a function for each `src` value, provide a callback function. If `src` is an iterable or an array-like object containing complex numbers, the callback must return either a complex number

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function map( z ) {
    return new Complex64( realf(z)*2.0, imagf(z)*2.0 );
}

// Create a source array:
var src = [ new Complex64( 1.0, -1.0 ) ];

// Create a new complex number array by scaling the source array:
var arr = Complex64Array.from( src, map );
// returns <Complex64Array>

var len = arr.length;
// returns 1

var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns -2.0
```

or an array-like object containing real and imaginary components

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

// Return a callback which reuses allocated memory...
function mapFcn() {
    var buf = new Float32Array( 2 );
    return map;

    function map( z ) {
        buf[ 0 ] = realf( z ) * 2.0;
        buf[ 1 ] = imagf( z ) * 2.0;
        return buf;
    }
}

// Create a source array:
var src = [ new Complex64( 1.0, -1.0 ), new Complex64( 2.0, -2.0 ) ];

// Create a new complex number array by scaling the source array:
var arr = Complex64Array.from( src, mapFcn() );
// returns <Complex64Array>

var len = arr.length;
// returns 2

var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns -2.0

z = arr.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 4.0

im = imagf( z );
// returns -4.0
```

If `src` is an array-like object containing interleaved real and imaginary components, the callback is invoked for each component and should return the transformed component value.

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function map( v ) {
    return v * 2.0;
}

// Create a source array:
var src = new Float32Array( [ 1.0, -1.0 ] );

// Create a new complex number array by scaling the source array:
var arr = Complex64Array.from( src, map );
// returns <Complex64Array>

var len = arr.length;
// returns 1

var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns -2.0
```

A callback function is provided two arguments:

-   **value**: source value.
-   **index**: source index.

To set the callback execution context, provide a `thisArg`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function map( z ) {
    this.count += 1;
    return new Complex64( realf(z)*2.0, imagf(z)*2.0 );
}

// Create a source array:
var src = [ new Complex64( 1.0, -1.0 ), new Complex64( 1.0, -1.0 ) ];

// Define an execution context:
var ctx = {
    'count': 0
};

// Create a new complex number array by scaling the source array:
var arr = Complex64Array.from( src, map, ctx );
// returns <Complex64Array>

var len = arr.length;
// returns 2

var n = ctx.count;
// returns 2
```

<a name="static-method-of"></a>

#### Complex64Array.of( element0\[, element1\[, ...elementN]] )

Creates a new 64-bit complex number array from a variable number of arguments.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var arr = Complex64Array.of( 1.0, -1.0, 2.0, -2.0 );
// returns <Complex64Array>

var len = arr.length;
// returns 2

var z1 = new Complex64( 1.0, -1.0 );
var z2 = new Complex64( 2.0, -2.0 );

arr = Complex64Array.of( z1, z2 );
// returns <Complex64Array>

len = arr.length;
// returns 2
```

<a name="method-at"></a>

#### Complex64Array.prototype.at( i )

Returns an array element located at integer position (index) `i`, with support for both nonnegative and negative integer positions.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 10 );

// Set the first, second, and last elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 9.0, -9.0 ], 9 );

// Get the first element:
var z = arr.at( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns -1.0

// Get the last element:
z = arr.at( -1 );
// returns <Complex64>

re = realf( z );
// returns 9.0

im = imagf( z );
// returns -9.0
```

If provided an out-of-bounds index, the method returns `undefined`.

```javascript
var arr = new Complex64Array( 10 );

var z = arr.at( 100 );
// returns undefined

z = arr.at( -100 );
// returns undefined
```

<a name="method-copy-within"></a>

#### Complex64Array.prototype.copyWithin( target, start\[, end] )

Copies a sequence of elements within the array starting at `start` and ending at `end` (non-inclusive) to the position starting at `target`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 4 );

// Set the array elements:
arr.set( new Complex64( 1.0, -1.0 ), 0 );
arr.set( new Complex64( 2.0, -2.0 ), 1 );
arr.set( new Complex64( 3.0, -3.0 ), 2 );
arr.set( new Complex64( 4.0, -4.0 ), 3 );

// Get the first array element:
var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns -1.0

// Get the second array element:
z = arr.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns -2.0

// Copy the last two elements to the first two elements:
arr.copyWithin( 0, 2 );

// Get the first array element:
z = arr.get( 0 );
// returns <Complex64>

re = realf( z );
// returns 3.0

im = imagf( z );
// returns -3.0

// Get the second array element:
z = arr.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 4.0

im = imagf( z );
// returns -4.0
```

By default, `end` equals the number of array elements (i.e., one more than the last array index). To limit the sequence length, provide an `end` argument.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 4 );

// Set the array elements:
arr.set( new Complex64( 1.0, -1.0 ), 0 );
arr.set( new Complex64( 2.0, -2.0 ), 1 );
arr.set( new Complex64( 3.0, -3.0 ), 2 );
arr.set( new Complex64( 4.0, -4.0 ), 3 );

// Get the third array element:
var z = arr.get( 2 );
// returns <Complex64>

var re = realf( z );
// returns 3.0

var im = imagf( z );
// returns -3.0

// Get the last array element:
z = arr.get( 3 );
// returns <Complex64>

re = realf( z );
// returns 4.0

im = imagf( z );
// returns -4.0

// Copy the first two elements to the last two elements:
arr.copyWithin( 2, 0, 2 );

// Get the third array element:
z = arr.get( 2 );
// returns <Complex64>

re = realf( z );
// returns 1.0

im = imagf( z );
// returns -1.0

// Get the last array element:
z = arr.get( 3 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns -2.0
```

When a `target`, `start`, and/or `end` index is negative, the respective index is determined relative to the last array element. The following example achieves the same behavior as the previous example:

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 4 );

// Set the array elements:
arr.set( new Complex64( 1.0, -1.0 ), 0 );
arr.set( new Complex64( 2.0, -2.0 ), 1 );
arr.set( new Complex64( 3.0, -3.0 ), 2 );
arr.set( new Complex64( 4.0, -4.0 ), 3 );

// Get the third array element:
var z = arr.get( 2 );
// returns <Complex64>

var re = realf( z );
// returns 3.0

var im = imagf( z );
// returns -3.0

// Get the last array element:
z = arr.get( 3 );
// returns <Complex64>

re = realf( z );
// returns 4.0

im = imagf( z );
// returns -4.0

// Copy the first two elements to the last two elements using negative indices:
arr.copyWithin( -2, -4, -2 );

// Get the third array element:
z = arr.get( 2 );
// returns <Complex64>

re = realf( z );
// returns 1.0

im = imagf( z );
// returns -1.0

// Get the last array element:
z = arr.get( 3 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns -2.0
```

<a name="method-entries"></a>

#### Complex64Array.prototype.entries()

Returns an iterator for iterating over array key-value pairs.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = [
    new Complex64( 1.0, -1.0 ),
    new Complex64( 2.0, -2.0 ),
    new Complex64( 3.0, -3.0 )
];
arr = new Complex64Array( arr );

// Create an iterator:
var it = arr.entries();

// Iterate over the key-value pairs...
var v = it.next().value;
// returns [ 0, <Complex64> ]

var re = realf( v[ 1 ] );
// returns 1.0

var im = imagf( v[ 1 ] );
// returns -1.0

v = it.next().value;
// returns [ 1, <Complex64> ]

re = realf( v[ 1 ] );
// returns 2.0

im = imagf( v[ 1 ] );
// returns -2.0

v = it.next().value;
// returns [ 2, <Complex64> ]

re = realf( v[ 1 ] );
// returns 3.0

im = imagf( v[ 1 ] );
// returns -3.0

var bool = it.next().done;
// returns true
```

The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties:

-   **next**: function which returns an [iterator][mdn-iterator-protocol] protocol-compliant object containing the next iterated value (if one exists) assigned to a `value` property and a `done` property having a `boolean` value indicating whether the [iterator][mdn-iterator-protocol] is finished.
-   **return**: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.

<a name="method-every"></a>

#### Complex64Array.prototype.every( predicate\[, thisArg] )

Returns a boolean indicating whether all elements pass a test.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

// Check whether all elements pass a test:
var z = arr.every( predicate );
// returns true
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
function predicate( v, i ) {
    this.count += 1;
    return ( i >= 0 );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.every( predicate, context );
// returns true

var count = context.count;
// returns 3
```

<a name="method-fill"></a>

#### Complex64Array.prototype.fill( value\[, start\[, end]] )

Returns a modified typed array filled with a fill value.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 3 );

// Set all elements to the same value:
arr.fill( new Complex64( 1.0, 1.0 ) );

var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns 1.0

z = arr.get( 2 );
// returns <Complex64>

re = realf( z );
// returns 1.0

im = imagf( z );
// returns 1.0

// Fill all elements starting from the second element:
arr.fill( new Complex64( 2.0, 2.0 ), 1 );

z = arr.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns 2.0

z = arr.get( 2 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns 2.0

// Fill all elements from first element until the second-to-last element:
arr.fill( new Complex64( 3.0, 3.0 ), 0, 2 );

z = arr.get( 0 );
// returns <Complex64>

re = realf( z );
// returns 3.0

im = imagf( z );
// returns 3.0

z = arr.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 3.0

im = imagf( z );
// returns 3.0
```

When a `start` and/or `end` index is negative, the respective index is determined relative to the last array element.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 3 );

// Set all array elements, except the last element, to the same value:
arr.fill( new Complex64( 1.0, 1.0 ), 0, -1 );

var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns 1.0

z = arr.get( arr.length - 1 );
// returns <Complex64>

re = realf( z );
// returns 0.0

im = imagf( z );
// returns 0.0
```

<a name="method-filter"></a>

#### Complex64Array.prototype.filter( predicate\[, thisArg] )

Returns a new array containing the elements of an array which pass a test implemented by a predicate function.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var out = arr.filter( predicate );
// returns <Complex64Array>

var len = out.length;
// returns 1

var z = out.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns 2.0
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v, i ) {
    this.count += 1;
    return ( i >= 0 && realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var out = arr.filter( predicate, context );
// returns <Complex64Array>

var len = out.length;
// returns 2

var count = context.count;
// returns 3
```

<a name="method-find"></a>

#### Complex64Array.prototype.find( predicate\[, thisArg] )

Returns the first element in an array for which a predicate function returns a truthy value.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
var Complex64 = require( '@stdlib/complex/float32/ctor' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.find( predicate );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns 1.0
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v, i ) {
    this.count += 1;
    return ( i >= 0 && realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.find( predicate, context );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns 2.0

var count = context.count;
// returns 2
```

<a name="method-find-index"></a>

#### Complex64Array.prototype.findIndex( predicate\[, thisArg] )

Returns the index of the first element in an array for which a predicate function returns a truthy value.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var idx = arr.findIndex( predicate );
// returns 2
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v, i ) {
    this.count += 1;
    return ( i >= 0 && realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var idx = arr.findIndex( predicate, context );
// returns -1

var count = context.count;
// returns 3
```

<a name="method-find-last"></a>

#### Complex64Array.prototype.findLast( predicate\[, thisArg] )

Returns the last element in an array for which a predicate function returns a truthy value.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
var Complex64 = require( '@stdlib/complex/float32/ctor' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.findLast( predicate );
// returns <Complex64>

var re = realf( z );
// returns 3.0

var im = imagf( z );
// returns 3.0
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v, i ) {
    this.count += 1;
    return ( i >= 0 && realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var z = arr.findLast( predicate, context );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns 2.0

var count = context.count;
// returns 2
```

<a name="method-find-last-index"></a>

#### Complex64Array.prototype.findLastIndex( predicate\[, thisArg] )

Returns the index of the last element in an array for which a predicate function returns a truthy value.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var idx = arr.findLastIndex( predicate );
// returns 1
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v, i ) {
    this.count += 1;
    return ( i >= 0 && realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var idx = arr.findLastIndex( predicate, context );
// returns -1

var count = context.count;
// returns 3
```

<a name="method-for-each"></a>

#### Complex64Array.prototype.forEach( callbackFn\[, thisArg] )

Invokes a function once for each array element.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

function log( v, i ) {
    console.log( '%s: %s', i, v.toString() );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

arr.forEach( log );
/* =>
    0: 1 + 1i
    1: 2 + 2i
    2: 3 + 3i
*/
```

The invoked function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

function fcn( v, i ) {
    this.count += 1;
    console.log( '%s: %s', i, v.toString() );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

arr.forEach( fcn, context );
/* =>
    0: 1 + 1i
    1: 2 + 2i
    2: 3 + 3i
*/

var count = context.count;
// returns 3
```

<a name="method-get"></a>

#### Complex64Array.prototype.get( i )

Returns an array element located at a nonnegative integer position (index) `i`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 10 );

// Set the first element:
arr.set( [ 1.0, -1.0 ], 0 );

// Get the first element:
var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns -1.0
```

If provided an out-of-bounds index, the method returns `undefined`.

```javascript
var arr = new Complex64Array( 10 );

var z = arr.get( 100 );
// returns undefined
```

<a name="method-includes"></a>

#### Complex64Array.prototype.includes( searchElement\[, fromIndex] )

Returns a boolean indicating whether an array includes a provided value.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var arr = new Complex64Array( 5 );

arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );
arr.set( [ 4.0, -4.0 ], 3 );
arr.set( [ 5.0, -5.0 ], 4 );

var bool = arr.includes( new Complex64( 3.0, -3.0 ) );
// returns true

bool = arr.includes( new Complex64( 3.0, -3.0 ), 3 );
// returns false

bool = arr.includes( new Complex64( 4.0, -4.0 ), -3 );
// returns true
```

<a name="method-index-of"></a>

#### Complex64Array.prototype.indexOf( searchElement\[, fromIndex] )

Returns the first index at which a given element can be found.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var arr = new Complex64Array( 5 );

arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );
arr.set( [ 4.0, -4.0 ], 3 );
arr.set( [ 2.0, -2.0 ], 4 );

var idx = arr.indexOf( new Complex64( 3.0, -3.0 ) );
// returns 2

idx = arr.indexOf( new Complex64( 2.0, -2.0 ), 2 );
// returns 4

idx = arr.indexOf( new Complex64( 4.0, -4.0 ), -3 );
// returns 3
```

If `searchElement` is not present in the array, the method returns `-1`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var arr = new Complex64Array( 10 );

arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );

var idx = arr.indexOf( new Complex64( 3.0, -3.0 ) );
// returns -1

idx = arr.indexOf( new Complex64( 1.0, -1.0 ), 1 );
// returns -1
```

<a name="method-join"></a>

#### Complex64Array.prototype.join( \[separator] )

Returns a new string by concatenating all array elements.

```javascript
var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var str = arr.join();
// returns '1 + 1i,2 - 2i,3 + 3i'
```

By default, the method separates serialized array elements with a comma. To use an alternative separator, provide a `separator` string.

```javascript
var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var str = arr.join( '/' );
// returns '1 + 1i/2 - 2i/3 + 3i'
```

<a name="method-keys"></a>

#### Complex64Array.prototype.keys()

Returns an iterator for iterating over each index key in a typed array.

```javascript
var arr = new Complex64Array( 2 );

arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );

var iter = arr.keys();

var v = iter.next().value;
// returns 0

v = iter.next().value;
// returns 1

var bool = iter.next().done;
// returns true
```

The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties:

-   **next**: function which returns an [iterator][mdn-iterator-protocol] protocol-compliant object containing the next iterated value (if one exists) assigned to a `value` property and a `done` property having a `boolean` value indicating whether the [iterator][mdn-iterator-protocol] is finished.
-   **return**: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.

<a name="method-last-index-of"></a>

#### Complex64Array.prototype.lastIndexOf( searchElement\[, fromIndex] )

Returns the last index at which a given element can be found.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var arr = new Complex64Array( 5 );

arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );
arr.set( [ 4.0, -4.0 ], 3 );
arr.set( [ 2.0, -2.0 ], 4 );

var idx = arr.lastIndexOf( new Complex64( 3.0, -3.0 ) );
// returns 2

idx = arr.lastIndexOf( new Complex64( 2.0, -2.0 ), 2 );
// returns 1

idx = arr.lastIndexOf( new Complex64( 4.0, -4.0 ), -1 );
// returns 3
```

If `searchElement` is not present in the array, the method returns `-1`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var arr = new Complex64Array( 10 );

arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );

var idx = arr.lastIndexOf( new Complex64( 3.0, -3.0 ) );
// returns -1

idx = arr.lastIndexOf( new Complex64( 2.0, -2.0 ), 0 );
// returns -1
```

<a name="method-map"></a>

#### Complex64Array.prototype.map( callbackFn\[, thisArg] )

Returns a new array with each element being the result of a provided callback function.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function scale( v ) {
    return new Complex64( 2.0*realf( v ), 2.0*imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, -2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var out = arr.map( scale );
// returns <Complex64Array>

var z = out.get( 0 );
// returns <complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns -2.0
```

The callback function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function scale( v ) {
    this.count += 1;
    return new Complex64( 2.0*realf( v ), 2.0*imagf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var out = arr.map( scale, context );
// returns <Complex64Array>

var count = context.count;
// returns 3
```

<a name="method-reduce"></a>

#### Complex64Array.prototype.reduce( reducerFn\[, initialValue] )

Applies a provided callback function to each element of the array, in order, passing in the return value from the calculation on the preceding element and returning the accumulated result upon completion.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
var caddf = require( '@stdlib/complex/float32/base/add' );

var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.reduce( caddf );
// returns <Complex64>

var re = realf( z );
// returns 6.0

var im = imagf( z );
// returns 6.0
```

The reducer function is provided four arguments:

-   **acc**: accumulated result.
-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

By default, the function initializes the accumulated result to the first element in the array and passes the second array element as `value` during the first invocation of the provided callback. To begin accumulation from a different starting value and pass in the first array element as `value` during the first invocation of the provided callback, provide an `initialValue` argument.

```javascript
var realf = require( '@stdlib/complex/float32/real' );

function reducer( acc, v ) {
    acc += realf( v );
    return acc;
}

var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.reduce( reducer, 0.0 );
// returns 6.0
```

<a name="method-reduce-right"></a>

#### Complex64Array.prototype.reduceRight( reducerFn\[, initialValue] )

Applies a provided callback function to each element of the array, in reverse order, passing in the return value from the calculation on the following element and returning the accumulated result upon completion.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
var caddf = require( '@stdlib/complex/float32/base/add' );

var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.reduceRight( caddf );
// returns <Complex64>

var re = realf( z );
// returns 6.0

var im = imagf( z );
// returns 6.0
```

The reducer function is provided four arguments:

-   **acc**: accumulated result.
-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

By default, the function initializes the accumulated result to the last element in the array and passes the second-last array element as `value` during the first invocation of the provided callback. To begin accumulation from a different starting value and pass in the last array element as `value` during the first invocation of the provided callback, provide an `initialValue` argument.

```javascript
var realf = require( '@stdlib/complex/float32/real' );

function reducer( acc, v ) {
    acc += realf( v );
    return acc;
}

var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var z = arr.reduceRight( reducer, 0.0 );
// returns 6.0
```

<a name="method-reverse"></a>

#### Complex64Array.prototype.reverse()

Reverses an array in-place.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 3 );

arr.set( [ 1.0, 1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, 3.0 ], 2 );

var out = arr.reverse();
// returns <Complex64Array>

var z = out.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 3.0

var im = imagf( z );
// returns 3.0

z = out.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns 2.0

z = out.get( 2 );
// returns <Complex64>

re = realf( z );
// returns 1.0

im = imagf( z );
// returns 1.0
```

<a name="method-set"></a>

#### Complex64Array.prototype.set( z\[, i] )

Sets one or more array elements.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 10 );

// Get the first element:
var z = arr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 0.0

var im = imagf( z );
// returns 0.0

// Set the first element:
arr.set( new Complex64( 1.0, -1.0 ) );

// Get the first element:
z = arr.get( 0 );
// returns <Complex64>

re = realf( z );
// returns 1.0

im = imagf( z );
// returns -1.0
```

By default, the method sets array elements starting at position (index) `i = 0`. To set elements starting elsewhere in the array, provide an index argument `i`.

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 10 );

// Get the fifth element:
var z = arr.get( 4 );
// returns <Complex64>

var re = realf( z );
// returns 0.0

var im = imagf( z );
// returns 0.0

// Set the fifth element:
arr.set( new Complex64( 1.0, -1.0 ), 4 );

// Get the fifth element:
z = arr.get( 4 );
// returns <Complex64>

re = realf( z );
// returns 1.0

im = imagf( z );
// returns -1.0
```

In addition to providing a complex number, to set one or more array elements, provide an array-like object containing either complex numbers

```javascript
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 10 );

// Define an array of complex numbers:
var buf = [
    new Complex64( 1.0, -1.0 ),
    new Complex64( 2.0, -2.0 ),
    new Complex64( 3.0, -3.0 )
];

// Set the fifth, sixth, and seventh elements:
arr.set( buf, 4 );

// Get the sixth element:
var z = arr.get( 5 );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns -2.0
```

or interleaved real and imaginary components

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( 10 );

// Define an interleaved array of real and imaginary components:
var buf = new Float32Array( [ 1.0, -1.0, 2.0, -2.0, 3.0, -3.0 ] );

// Set the fifth, sixth, and seventh elements:
arr.set( buf, 4 );

// Get the sixth element:
var z = arr.get( 5 );
// returns <Complex64>

var re = realf( z );
// returns 2.0

var im = imagf( z );
// returns -2.0
```

A few notes:

-   If `i` is out-of-bounds, the method throws an error.
-   If a target array cannot accommodate all values (i.e., the length of source array plus `i` exceeds the target array length), the method throws an error.
-   If provided a [typed array][@stdlib/array/typed] which shares an [`ArrayBuffer`][@stdlib/array/buffer] with the target array, the method will intelligently copy the source range to the destination range.

<a name="method-slice"></a>

#### Complex64Array.prototype.slice( \[start\[, end]] )

Copies a portion of a typed array to a new typed array.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );

var out = arr.slice();
// returns <Complex64Array>

var len = out.length;
// returns 4

var z = out.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns 2.0

z = out.get( len-1 );
// returns <Complex64>

re = realf( z );
// returns 7.0

im = imagf( z );
// returns 8.0
```

By default, the method returns a typed array beginning with the first array element. To specify an alternative array index at which to begin, provide a `start` index (inclusive).

```javascript
var imagf = require( '@stdlib/complex/float32/imag' );
var realf = require( '@stdlib/complex/float32/real' );

var arr = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );

var out = arr.slice( 1 );
// returns <Complex64Array>

var len = out.length;
// returns 3

var z = out.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 3.0

var im = imagf( z );
// returns 4.0
```

By default, the method returns a typed array which includes all array elements after `start`. To limit the number of array elements after `start`, provide an `end` index (exclusive).

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );

var out = arr.slice( 1, -1 );
// returns <Complex64Array>

var len = out.length;
// returns 2

var z = out.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 3.0

var im = imagf( z );
// returns 4.0

z = out.get( len-1 );
// returns <Complex64>

re = realf( z );
// returns 5.0

im = imagf( z );
// returns 6.0
```

<a name="method-some"></a>

#### Complex64Array.prototype.some( predicate\[, thisArg] )

Returns a boolean indicating whether at least one element passes a test.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v ) {
    return ( realf( v ) === imagf( v ) );
}

var arr = new Complex64Array( 3 );

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

// Check whether at least one element passes a test:
var z = arr.some( predicate );
// returns true
```

The `predicate` function is provided three arguments:

-   **value**: current array element.
-   **index**: current array element index.
-   **arr**: the array on which this method was called.

To set the function execution context, provide a `thisArg`.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function predicate( v, i ) {
    this.count += 1;
    return ( imagf( v ) === realf( v ) );
}

var arr = new Complex64Array( 3 );

var context = {
    'count': 0
};

// Set the first three elements:
arr.set( [ 1.0, -1.0 ], 0 );
arr.set( [ 2.0, 2.0 ], 1 );
arr.set( [ 3.0, -3.0 ], 2 );

var z = arr.some( predicate, context );
// returns true

var count = context.count;
// returns 2
```

<a name="method-sort"></a>

#### Complex64Array.prototype.sort( compareFcn )

Sorts an array in-place.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

function compare( a, b ) {
    var re1;
    var re2;
    var im1;
    var im2;
    re1 = realf( a );
    re2 = realf( b );
    if ( re1 < re2 ) {
        return -1;
    }
    if ( re1 > re2 ) {
        return 1;
    }
    im1 = imagf( a );
    im2 = imagf( b );
    if ( im1 < im2 ) {
        return -1;
    }
    if ( im1 > im2 ) {
        return 1;
    }
    return 0;
}

var arr = new Complex64Array( 3 );

arr.set( [ 3.0, -3.0 ], 0 );
arr.set( [ 1.0, -1.0 ], 1 );
arr.set( [ 2.0, -2.0 ], 2 );

var out = arr.sort( compare );
// returns <Complex64Array>

var z = out.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns -1.0

z = out.get( 1 );
// returns <Complex64>

re = realf( z );
// returns 2.0

im = imagf( z );
// returns -2.0

z = out.get( 2 );
// returns <Complex64>

re = realf( z );
// returns 3.0

im = imagf( z );
// returns -3.0
```

The `compareFcn` determines the order of the elements. The function is called with the following arguments:

-   **a**: the first element for comparison.
-   **b**: the second element for comparison.

The function should return a number where:

-   a negative value indicates that `a` should come before `b`.
-   a positive value indicates that `a` should come after `b`.
-   zero or `NaN` indicates that `a` and `b` are considered equal.

In contrast to real numbers, one cannot define a default order relation which is compatible with multiplication. Accordingly, users **must** explicitly provide a `compareFcn` argument and are thus responsible for specifying a complex number ordering.

<a name="method-subarray"></a>

#### Complex64Array.prototype.subarray( \[begin\[, end]] )

Creates a new typed array view over the same underlying [`ArrayBuffer`][@stdlib/array/buffer] and with the same underlying data type as the host array.

```javascript
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );

var arr = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );

var subarr = arr.subarray();
// returns <Complex64Array>

var len = subarr.length;
// returns 4

var z = subarr.get( 0 );
// returns <Complex64>

var re = realf( z );
// returns 1.0

var im = imagf( z );
// returns 2.0

z = subarr.get( len-1 );
// returns <Complex64>

re = realf( z );
// returns 7.0

im = imagf( z );
// returns 8.0
```

By default, the method creates a typed array view beginning with the first array element. To specify an alternative array index at