79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
|
/**
|
||
|
|
* @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 unary function to each element retrieved from a strided input array according to a callback function and assigns each result to an element in a strided output array.
|
||
|
|
*
|
||
|
|
* @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 - destination array/collection
|
||
|
|
* @param {integer} strideY - `y` stride length
|
||
|
|
* @param {NonNegativeInteger} offsetY - starting `y` index
|
||
|
|
* @param {Function} fcn - unary function to apply to callback return values
|
||
|
|
* @param {Callback} clbk - callback
|
||
|
|
* @param {*} [thisArg] - callback execution context
|
||
|
|
* @returns {Collection} `y`
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var abs = require( '@stdlib/math/base/special/abs' );
|
||
|
|
*
|
||
|
|
* function accessor( v ) {
|
||
|
|
* return v * 2.0;
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* var x = [ 1.0, -2.0, 3.0, -4.0, 5.0 ];
|
||
|
|
* var y = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];
|
||
|
|
*
|
||
|
|
* mapBy( x.length, x, 1, 0, y, 1, 0, abs, accessor );
|
||
|
|
*
|
||
|
|
* console.log( y );
|
||
|
|
* // => [ 2.0, 4.0, 6.0, 8.0, 10.0 ]
|
||
|
|
*/
|
||
|
|
function mapBy( N, x, strideX, offsetX, y, strideY, offsetY, fcn, clbk, thisArg ) { // eslint-disable-line max-len
|
||
|
|
var ix;
|
||
|
|
var iy;
|
||
|
|
var v;
|
||
|
|
var i;
|
||
|
|
|
||
|
|
if ( N <= 0 ) {
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
ix = offsetX;
|
||
|
|
iy = offsetY;
|
||
|
|
for ( i = 0; i < N; i++ ) {
|
||
|
|
v = clbk.call( thisArg, x[ ix ], i, ix, iy, x, y );
|
||
|
|
if ( v !== void 0 ) {
|
||
|
|
y[ iy ] = fcn( v );
|
||
|
|
}
|
||
|
|
ix += strideX;
|
||
|
|
iy += strideY;
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = mapBy;
|