time-to-botec

Benchmark sampling in different programming languages
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ndarray.js (2159B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2021 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MAIN //
     22 
     23 /**
     24 * 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.
     25 *
     26 * @param {NonNegativeInteger} N - number of indexed elements
     27 * @param {Collection} x - input array/collection
     28 * @param {integer} strideX - `x` stride length
     29 * @param {NonNegativeInteger} offsetX - starting `x` index
     30 * @param {Collection} y - destination array/collection
     31 * @param {integer} strideY - `y` stride length
     32 * @param {NonNegativeInteger} offsetY - starting `y` index
     33 * @param {Function} fcn - unary function to apply to callback return values
     34 * @param {Callback} clbk - callback
     35 * @param {*} [thisArg] - callback execution context
     36 * @returns {Collection} `y`
     37 *
     38 * @example
     39 * var abs = require( '@stdlib/math/base/special/abs' );
     40 *
     41 * function accessor( v ) {
     42 *     return v * 2.0;
     43 * }
     44 *
     45 * var x = [ 1.0, -2.0, 3.0, -4.0, 5.0 ];
     46 * var y = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];
     47 *
     48 * mapBy( x.length, x, 1, 0, y, 1, 0, abs, accessor );
     49 *
     50 * console.log( y );
     51 * // => [ 2.0, 4.0, 6.0, 8.0, 10.0 ]
     52 */
     53 function mapBy( N, x, strideX, offsetX, y, strideY, offsetY, fcn, clbk, thisArg ) { // eslint-disable-line max-len
     54 	var ix;
     55 	var iy;
     56 	var v;
     57 	var i;
     58 
     59 	if ( N <= 0 ) {
     60 		return y;
     61 	}
     62 	ix = offsetX;
     63 	iy = offsetY;
     64 	for ( i = 0; i < N; i++ ) {
     65 		v = clbk.call( thisArg, x[ ix ], i, ix, iy, x, y );
     66 		if ( v !== void 0 ) {
     67 			y[ iy ] = fcn( v );
     68 		}
     69 		ix += strideX;
     70 		iy += strideY;
     71 	}
     72 	return y;
     73 }
     74 
     75 
     76 // EXPORTS //
     77 
     78 module.exports = mapBy;