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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';
// MODULES //
var isArrayLikeObject = require( '@stdlib/assert/is-array-like-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Applies a function to each nested element in a three-dimensional nested array and assigns the result to a nested element in a new three-dimensional nested array.
*
* ## Notes
*
* - The applied function is provided the following arguments:
*
* - **value**: array element.
* - **indices**: current array element indices.
* - **arr**: input array.
*
* @param {ArrayLikeObject<ArrayLikeObject>} arr - three-dimensional nested array
* @param {Function} fcn - function to apply
* @param {*} [thisArg] - function execution context
* @throws {TypeError} first argument must be a three-dimensional nested array
* @throws {TypeError} second argument must be a function
* @returns {ArrayArray} three-dimensional nested array
*
* @example
* var naryFunction = require( '@stdlib/utils/nary-function' );
* var abs = require( '@stdlib/math/base/special/abs' );
*
* var arr = [
* [ [ -1, -2, -3 ] ],
* [ [ -4, -5, -6 ] ]
* ];
*
* var out = map3d( arr, naryFunction( abs, 1 ) );
* // returns [ [ [ 1, 2, 3 ] ], [ [ 4, 5, 6 ] ] ]
*/
function map3d( arr, fcn, thisArg ) {
var out;
var t1;
var t2;
var a1;
var a2;
var S0;
var S1;
var S2;
var i0;
var i1;
var i2;
if ( !isArrayLikeObject( arr ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an array-like object. Value: `%s`.', arr ) );
}
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', fcn ) );
}
S0 = arr.length;
out = [];
for ( i0 = 0; i0 < S0; i0++ ) {
a1 = arr[ i0 ];
if ( !isArrayLikeObject( a1 ) ) { // note: cannot support the more general "collections" here (which includes typed arrays having more than 2^32-1 elements), as the output array is limited to 2^32-1 elements; thus, we opt for the lowest common denominator: generic arrays
throw new TypeError( format( 'invalid argument. First argument must be a three-dimensional nested array. Index: `%u`. Value: `%s`.', i0, a1 ) );
}
S1 = a1.length;
t1 = [];
for ( i1 = 0; i1 < S1; i1++ ) {
a2 = a1[ i1 ];
if ( !isArrayLikeObject( a2 ) ) { // note: cannot support the more general "collections" here (which includes typed arrays having more than 2^32-1 elements), as the output array is limited to 2^32-1 elements; thus, we opt for the lowest common denominator: generic arrays
throw new TypeError( format( 'invalid argument. First argument must be a three-dimensional nested array. Index: `%u`. Value: `%s`.', i0, a1 ) );
}
S2 = a2.length;
t2 = [];
for ( i2 = 0; i2 < S2; i2++ ) {
t2.push( fcn.call( thisArg, a2[ i2 ], [ i0, i1, i2 ], arr ) );
}
t1.push( t2 );
}
out.push( t1 );
}
return out;
}
// EXPORTS //
module.exports = map3d;
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