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* @license Apache-2.0
*
* Copyright (c) 2026 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 setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isCollection = require( '@stdlib/assert/is-collection' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator which iterates over the Cartesian product of two array-like objects.
*
* ## Notes
*
* - The order of the returned tuples follows the order of iteration of the provided array-like objects, with elements of the second array-like object varying fastest.
* - If provided one or more empty array-like objects, the returned iterator is empty.
* - If an environment supports `Symbol.iterator`, the returned iterator is iterable.
*
* @param {Collection} x1 - first input array
* @param {Collection} x2 - second input array
* @throws {TypeError} first argument must be an array-like object
* @throws {TypeError} second argument must be an array-like object
* @returns {Iterator} iterator
*
* @example
* var iter = iterCartesianProduct( [ 1, 2, 3 ], [ 4, 5 ] );
*
* var v = iter.next().value;
* // returns [ 1, 4 ]
*
* v = iter.next().value;
* // returns [ 1, 5 ]
*
* v = iter.next().value;
* // returns [ 2, 4 ]
*
* // ...
*/
function iterCartesianProduct( x1, x2 ) {
var get1;
var get2;
var iter;
var FLG;
var M;
var N;
var i;
var j;
if ( !isCollection( x1 ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an array-like object. Value: `%s`.', x1 ) );
}
if ( !isCollection( x2 ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an array-like object. Value: `%s`.', x2 ) );
}
get1 = resolveGetter( x1 );
get2 = resolveGetter( x2 );
M = x1.length;
N = x2.length;
i = 0;
j = 0;
// Create an iterator protocol-compliant object:
iter = {};
setReadOnly( iter, 'next', next );
setReadOnly( iter, 'return', end );
// If an environment supports `Symbol.iterator`, make the iterator iterable:
if ( iteratorSymbol ) {
setReadOnly( iter, iteratorSymbol, factory );
}
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next() {
var v;
if ( FLG || N === 0 || i >= M ) {
return {
'done': true
};
}
v = [ get1( x1, i ), get2( x2, j ) ];
// Update the indices for the next iteration:
j += 1;
if ( j >= N ) {
j = 0;
i += 1;
}
return {
'value': v,
'done': false
};
}
/**
* Finishes an iterator.
*
* @private
* @param {*} [value] - value to return
* @returns {Object} iterator protocol-compliant object
*/
function end( value ) {
FLG = true;
if ( arguments.length ) {
return {
'value': value,
'done': true
};
}
return {
'done': true
};
}
/**
* Returns a new iterator.
*
* @private
* @returns {Iterator} iterator
*/
function factory() {
return iterCartesianProduct( x1, x2 );
}
}
// EXPORTS //
module.exports = iterCartesianProduct;
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