feat: add iter/cartesian-square

lib/node_modules/@stdlib/iter/cartesian-square/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 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.
+
+-->
+
+# iterCartesianSquare
+
+> Create an iterator which generates the Cartesian square of an input array-like object.
+
+<section class="intro">
+
+</section>
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var iterCartesianSquare = require( '@stdlib/iter/cartesian-square' );
+```
+
+#### iterCartesianSquare( x )
+
+Returns an iterator which generates the Cartesian Square of an input array-like object.
+
+```javascript
+var x = ['a', 'b', 'c'];
+var pair;
+var cartesianSquare = iterCartesianSquare( x, n );
+
+for ( pair of cartesianSquare ) {
+    console.log( pair );
+}
+
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+The function expects only one argument x, an array-like object.
+The returned iterator will generate all possible combinations from the input array x.
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+// Example : Generating Cartesian square of an array
+var x = [1, 2, 3];
+var cartesianSquare = iterCartesianSquare( x );
+var pair;
+
+for ( pair of cartesianSquare ) {
+    console.log( pair );
+}
+
+// Output:
+// [ 1, 1 ]
+// [ 1, 2 ]
+// [ 1, 3 ]
+// [ 2, 1 ]
+// [ 2, 2 ]
+// [ 2, 3 ]
+// [ 3, 1 ]
+// [ 3, 2 ]
+// [ 3, 3 ]
+
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="references">
+
+</section>
+
+<!-- /.references -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+<!-- <related-links> -->
+
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/iter/cartesian-square/benchmark/benchmark.js

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+
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 bench = require('@stdlib/bench');
+var pkg = require('./../package.json').name;
+var iterCartesianSquare = require('./../lib');
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var iterator;
+	var arr = ['a', 'b', 'c'];
+	var v;
+	var i;
+
+	// Run the benchmark...
+	b.tic();
+	for (i = 0; i < b.iterations; i++) {
+		// Reset the iterator:
+		iterator = iterCartesianSquare(arr);
+		v = iterator.next();
+
+		// Iterate over the Cartesian square:
+		while (!v.done) {
+			if (v.done) {
+				b.fail('should iterate over all elements');
+			}
+			v = iterator.next();
+		}
+	}
+	b.toc();
+	if (v.done) {
+		b.pass('benchmark finished');
+	} else {
+		b.fail('should have finished iteration');
+	}
+	b.end();
+});

lib/node_modules/@stdlib/iter/cartesian-square/docs/repl.txt

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+{{alias}}( x )
+    Returns an iterator which generates the Cartesian square of an input
+    array-like object. If an environment supports Symbol.iterator, the returned
+    iterator is iterable.
+
+    Parameters
+    ----------
+     x : collection
+        Input array-like object.
+
+    Returns
+    -------
+    iterator: Object
+        Iterator.
+
+    iterator.next(): Function
+        Returns an iterator protocol-compliant object containing the next
+        iterated value (if one exists) and a boolean flag indicating whether the
+        iterator is finished.
+
+    iterator.return( [value] ): Function
+        Finishes an iterator and returns a provided value.
+
+    Examples
+    --------
+    > var it = {{alias}}( [ '1', '2', '3' ] )
+    > var v = it.next().value
+    [ '1', '1' ]
+    > v = it.next().value
+    [ '1', '2' ]
+
+    See Also
+    --------

lib/node_modules/@stdlib/iter/cartesian-square/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { Iterator as Iter, IterableIterator } from '@stdlib/types/iter';
+import { ArrayLike } from '@stdlib/types/array';
+
+// Define a union type representing both iterable and non-iterable iterators:
+type Iterator = Iter | IterableIterator;
+
+/**
+* Returns an iterator which generates the Cartesian square of an input array-like object.
+*
+* @param x - Input array-like object.
+* @throws {TypeError} first argument must be an array-like object
+* @returns iterator
+*
+* @example
+* var iterCartesianSquare = require( '@stdlib/iter/cartesian-square' );
+*
+* var iterator = iterCartesianSquare( [ 'a', 'b', 'c' ] );
+* // returns <Object>
+*
+* var v = iterator.next().value;
+* // returns [ 'a', 'a' ]
+*
+* v = iterator.next().value;
+* // returns [ 'a', 'b' ]
+*
+* v = iterator.next().value;
+* // returns [ 'a', 'c' ]
+*
+* // ...
+*
+* var bool = iterator.next().done;
+* // returns true
+*/
+declare function iterCartesianSquare<T>( x: ArrayLike<T> | Iterable<T> ): Iterator;
+
+// EXPORTS //
+
+export = iterCartesianSquare;

lib/node_modules/@stdlib/iter/cartesian-square/docs/types/test.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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.
+*/
+
+import iterCartesianSquare = require( './index' );
+
+// TESTS //
+
+// The function returns an iterator...
+{
+	iterCartesianSquare( [ 'a', 'b', 'c' ] ); // $ExpectType Iterator
+	iterCartesianSquare( [ 1, 2, 3 ] ); // $ExpectType Iterator
+}
+
+// The compiler throws an error if the function is provided an argument which is not an array-like object...
+{
+	iterCartesianSquare( 5 ); // $ExpectError
+	iterCartesianSquare( true ); // $ExpectError
+	iterCartesianSquare( false ); // $ExpectError
+	iterCartesianSquare( null ); // $ExpectError
+	iterCartesianSquare( {} ); // $ExpectError
+	iterCartesianSquare( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided insufficient arguments...
+{
+	iterCartesianSquare(); // $ExpectError
+}
+

lib/node_modules/@stdlib/iter/cartesian-square/examples/index.js

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+
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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';
+
+var iterCartesianSquare = require( './../lib' );
+
+// Create an array:
+var arr = [ 'a', 'b', 'c' ];
+
+// Create an iterator:
+var iter = iterCartesianSquare( arr );
+
+// Iterate over the Cartesian square:
+var v = iter.next();
+while ( !v.done ) {
+	console.log( v.value );
+	v = iter.next();
+}