@stdlib/strided/base/mskunary-dtype-signatures/README.md

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# Masked Unary Signatures

> Generate a list of masked unary interface signatures from strided array [data types][@stdlib/strided/dtypes].

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## Usage

```javascript
var signatures = require( '@stdlib/strided/base/mskunary-dtype-signatures' );
```

#### signatures( dtypes1, dtypes2\[, options] )

Generates a list of masked unary interface signatures from strided array [data types][@stdlib/strided/dtypes].

```javascript
var dtypes = [
    'float64',
    'float32',
    'int32',
    'uint8'
];

var sigs = signatures( dtypes, dtypes );
// e.g., returns [ 'float32', 'uint8', 'float32', ... ]
```

The function accepts the following arguments:

-   **dtypes1**: list of supported [data types][@stdlib/strided/dtypes] for the input argument.
-   **dtypes2**: list of supported [data types][@stdlib/strided/dtypes] for the output argument.
-   **options**: options.

The function accepts the following options:

-   **enums**: `boolean` flag indicating whether to return signatures as a list of [data type][@stdlib/strided/dtypes] enumeration constants. Default: `false`.

When the `enums` options is `false`, the function returns an array of [data type][@stdlib/strided/dtypes] strings. To return [data type][@stdlib/strided/dtypes] enumeration constants, set the `enums` option to `true`.

```javascript
var dtypes = [
    'float64',
    'float32',
    'int32',
    'uint8'
];
var options = {
    'enums': true
};

var sigs = signatures( dtypes, dtypes, options );
// returns [...]
```

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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

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## Notes

-   The function returns a strided array having a stride length of `3` (i.e., every `3` elements define a masked unary interface signature).
-   For each signature (i.e., set of three consecutive non-overlapping strided array elements), the first element is the input data type, the second element is the mask data type, and the last element is the return data type.
-   All signatures follow type [promotion rules][@stdlib/ndarray/promotion-rules].
-   The mask array data type is always `uint8`.

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## Examples

<!-- eslint no-undef: "error" -->

```javascript
var dtypes = require( '@stdlib/strided/dtypes' );
var replace = require( '@stdlib/string/replace' );
var signatures = require( '@stdlib/strided/base/mskunary-dtype-signatures' );

// Get the list of supported strided array data types:
var dt = dtypes();

// Generate unary interface signatures:
var sigs = signatures( dt, dt );

// Format the output:
var str = replace( JSON.stringify( sigs ), /("[^"]+","[^"]+","[^"]+"),/g, '$1,\n' );
console.log( str );
```

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* * *

## See Also

-   <span class="package-name">[`@stdlib/strided/base/mskunary-signature-callbacks`][@stdlib/strided/base/mskunary-signature-callbacks]</span><span class="delimiter">: </span><span class="description">assign callbacks to masked unary interfaces according to type promotion rules.</span>

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[@stdlib/strided/dtypes]: https://github.com/stdlib-js/strided/tree/main/dtypes

[@stdlib/ndarray/promotion-rules]: https://www.npmjs.com/package/@stdlib/ndarray-promotion-rules

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[@stdlib/strided/base/mskunary-signature-callbacks]: https://github.com/stdlib-js/strided/tree/main/base/mskunary-signature-callbacks

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