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) 2022 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 resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// MAIN //
/**
* Returns the Cartesian product.
*
* @param {Collection} x1 - first input array
* @param {Collection} x2 - second input array
* @returns {Array<Array>} list of ordered tuples comprising the Cartesian product
*
* @example
* var x1 = [ 1, 2, 3 ];
* var x2 = [ 4, 5 ];
*
* var out = cartesianProduct( x1, x2 );
* // returns [ [ 1, 4 ], [ 1, 5 ], [ 2, 4 ], [ 2, 5 ], [ 3, 4 ], [ 3, 5 ] ]
*/
function cartesianProduct( x1, x2 ) {
var get1;
var get2;
var out;
var M;
var N;
var v;
var i;
var j;
get1 = resolveGetter( x1 );
get2 = resolveGetter( x2 );
M = x1.length;
N = x2.length;
out = [];
for ( i = 0; i < M; i++ ) {
v = get1( x1, i );
for ( j = 0; j < N; j++ ) {
out.push( [ v, get2( x2, j ) ] );
}
}
return out;
}
// EXPORTS //
module.exports = cartesianProduct;
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