@stdlib/array/base/unary2d-by/lib/main.js

Arrays.

/**
* @license Apache-2.0
*
* Copyright (c) 2023 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';

// MAIN //

/**
* Applies a unary function to each element retrieved from a two-dimensional nested input array according to a callback function and assigns results to elements in a two-dimensional nested output array.
*
* ## Notes
*
* -   The function assumes that the input and output arrays have the same shape.
*
* @param {ArrayLikeObject<Array<Collection>>} arrays - array-like object containing one input nested array and one output nested array
* @param {NonNegativeIntegerArray} shape - array shape
* @param {Function} fcn - unary function to apply to callback return values
* @param {Callback} clbk - callback function
* @param {*} [thisArg] - callback execution context
* @returns {void}
*
* @example
* var ones2d = require( '@stdlib/array/base/ones2d' );
* var zeros2d = require( '@stdlib/array/base/zeros2d' );
*
* function accessor( v ) {
*     return v - 2.0;
* }
*
* function scale( x ) {
*     return x * 10.0;
* }
*
* var shape = [ 2, 2 ];
*
* var x = ones2d( shape );
* var y = zeros2d( shape );
*
* unary2dBy( [ x, y ], shape, scale, accessor );
*
* console.log( y );
* // => [ [ -10.0, -10.0 ], [ -10.0, -10.0 ] ]
*/
function unary2dBy( arrays, shape, fcn, clbk ) {
	var thisArg;
	var S0;
	var S1;
	var i0;
	var i1;
	var x0;
	var y0;
	var x;
	var y;
	var v;

	S0 = shape[ 1 ];
	S1 = shape[ 0 ];
	if ( S0 <= 0 || S1 <= 0 ) {
		return;
	}
	if ( arguments.length > 4 ) {
		thisArg = arguments[ 4 ];
	}
	x = arrays[ 0 ];
	y = arrays[ 1 ];
	for ( i1 = 0; i1 < S1; i1++ ) {
		x0 = x[ i1 ];
		y0 = y[ i1 ];
		for ( i0 = 0; i0 < S0; i0++ ) {
			v = clbk.call( thisArg, x0[ i0 ], [ i1, i0 ], [ x, y ] );
			if ( v !== void 0 ) {
				y0[ i0 ] = fcn( v );
			}
		}
	}
}


// EXPORTS //

module.exports = unary2dBy;