Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 24x 12x 16x 21x 53x 53x 21x 16x 12x 12x 24x 23x 23x 30x 30x 53x 53x 30x 23x 12x 24x 2x 2x 2x 2x 2x | /**
* @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.
*/
/* eslint-disable max-len */
'use strict';
// MAIN //
/**
* Flattens a three-dimensional nested array according to a callback function.
*
* ## Notes
*
* - The function assumes that all nested arrays have the same length (i.e., the input array is **not** a ragged array).
*
* @param {Array<Array<Collection>>} x - input nested array
* @param {NonNegativeIntegerArray} shape - array shape
* @param {boolean} colexicographic - specifies whether to flatten array values in colexicographic order
* @param {Function} clbk - callback function
* @param {*} [thisArg] - callback execution context
* @returns {Array} flattened array
*
* @example
* function scale( v ) {
* return v * 2;
* }
*
* var x = [ [ [ 1, 2 ] ], [ [ 3, 4 ] ] ];
*
* var out = flatten3dBy( x, [ 2, 1, 2 ], false, scale );
* // returns [ 2, 4, 6, 8 ]
*
* @example
* function scale( v ) {
* return v * 2;
* }
*
* var x = [ [ [ 1, 2 ] ], [ [ 3, 4 ] ] ];
*
* var out = flatten3dBy( x, [ 2, 1, 2 ], true, scale );
* // returns [ 2, 6, 4, 8 ]
*/
function flatten3dBy( x, shape, colexicographic, clbk, thisArg ) {
var out;
var S0;
var S1;
var S2;
var i0;
var i1;
var i2;
var a0;
var a1;
// Extract loop variables:
S0 = shape[ 2 ]; // for nested arrays, the last dimensions have the fastest changing indices
S1 = shape[ 1 ];
S2 = shape[ 0 ];
// Initialize an output array:
out = [];
// Iterate over the array dimensions...
if ( colexicographic ) {
for ( i0 = 0; i0 < S0; i0++ ) {
for ( i1 = 0; i1 < S1; i1++ ) {
for ( i2 = 0; i2 < S2; i2++ ) {
out.push( clbk.call( thisArg, x[ i2 ][ i1 ][ i0 ], [ i2, i1, i0 ], x ) ); // equivalent to storing in column-major (Fortran-style) order
}
}
}
return out;
}
for ( i2 = 0; i2 < S2; i2++ ) {
a1 = x[ i2 ];
for ( i1 = 0; i1 < S1; i1++ ) {
a0 = a1[ i1 ];
for ( i0 = 0; i0 < S0; i0++ ) {
out.push( clbk.call( thisArg, a0[ i0 ], [ i2, i1, i0 ], x ) ); // equivalent to storing in row-major (C-style) order
}
}
}
return out;
}
// EXPORTS //
module.exports = flatten3dBy;
|