@stdlib/strided/base/nullary/lib/main.js

Strided.

/**
* @license Apache-2.0
*
* Copyright (c) 2022 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.
*/

'use strict';

// MODULES //

var isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
var accessorSetter = require( '@stdlib/array/base/accessor-setter' );
var setter = require( '@stdlib/array/base/setter' );
var dtype = require( '@stdlib/array/dtype' );
var strided = require( './nullary.js' );
var accessors = require( './accessors.js' );


// MAIN //

/**
* Applies a nullary callback and assigns results to elements in a strided output array.
*
* @param {ArrayLikeObject<Collection>} arrays - array-like object containing one output array
* @param {NonNegativeIntegerArray} shape - array-like object containing a single element, the number of indexed elements
* @param {IntegerArray} strides - array-like object containing the stride length for the output array
* @param {Callback} fcn - nullary callback
* @returns {void}
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* function fill() {
*     return 3.0;
* }
*
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
*
* var shape = [ x.length ];
* var strides = [ 1 ];
*
* nullary( [ x ], shape, strides, fill );
*
* console.log( x );
* // => <Float64Array>[ 3.0, 3.0, 3.0, 3.0, 3.0 ]
*/
function nullary( arrays, shape, strides, fcn ) {
	var xset;
	var x;

	x = arrays[ 0 ];
	if ( isAccessorArray( x ) ) {
		xset = accessorSetter( dtype( x ) );
	}
	if ( xset ) {
		xset = xset || setter( dtype( x ) );
		return accessors( arrays, shape, strides, [ xset ], fcn );
	}
	return strided( arrays, shape, strides, fcn );
}


// EXPORTS //

module.exports = nullary;