Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2021 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 binary function to each element retrieved from a strided input array according to a callback function and assigns results to a strided output array.
*
* @private
* @param {NonNegativeInteger} N - number of indexed elements
* @param {Collection} x - input array/collection
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting `x` index
* @param {Collection} y - input array/collection
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting `y` index
* @param {Collection} z - destination array/collection
* @param {integer} strideZ - `z` stride length
* @param {NonNegativeInteger} offsetZ - starting `z` index
* @param {Function} fcn - binary function to apply to callback return values
* @param {Callback} clbk - callback function which returns an array-like object containing two values
* @param {*} [thisArg] - callback execution context
* @returns {Collection} `z`
*
* @example
* var add = require( '@stdlib/number/float64/base/add' );
*
* function accessor( values ) {
* values[ 0 ] *= 2.0;
* values[ 1 ] *= 2.0;
* return values;
* }
*
* var x = [ 1.0, -2.0, 3.0, -4.0, 5.0 ];
* var y = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
* var z = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* mapBy2( x.length, x, 1, 0, y, 1, 0, z, 1, 0, add, accessor );
*
* console.log( z );
* // => [ 4.0, 0.0, 12.0, 0.0, 20.0 ]
*/
function mapBy2( N, x, strideX, offsetX, y, strideY, offsetY, z, strideZ, offsetZ, fcn, clbk, thisArg ) { // eslint-disable-line max-len, max-params
var args;
var o;
var a;
var v;
var i;
if ( N <= 0 ) {
return z;
}
o = [ offsetX, offsetY, offsetZ ];
a = [ x, y, z ];
args = [ 0, 0 ];
for ( i = 0; i < N; i++ ) {
args[ 0 ] = x[ o[0] ];
args[ 1 ] = y[ o[1] ];
v = clbk.call( thisArg, args, i, o, a );
if ( v !== void 0 ) {
z[ o[2] ] = fcn( v[ 0 ], v[ 1 ] );
}
o[ 0 ] += strideX;
o[ 1 ] += strideY;
o[ 2 ] += strideZ;
}
return z;
}
// EXPORTS //
module.exports = mapBy2;
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