@stdlib/ndarray-iter-indices

<details> <summary> About stdlib... </summary> <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p> <p>The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.</p> <p>When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.</p> <p>To join us in bringing numerical computing to the web, get started by checking us out on <a href="https://github.com/stdlib-js/stdlib">GitHub</a>, and please consider <a href="https://opencollective.com/stdlib">financially supporting stdlib</a>. We greatly appreciate your continued support!</p> </details> # nditerIndices [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]  > Create an iterator which returns indices for use indexing into an [`ndarray`][@stdlib/ndarray/ctor] having a specified shape.  <section class="intro"> </section>   <section class="installation"> ## Installation ```bash npm install @stdlib/ndarray-iter-indices ``` </section> <section class="usage"> ## Usage ```javascript var nditerIndices = require( '@stdlib/ndarray-iter-indices' ); ``` #### nditerIndices( shape\[, options] ) Returns an iterator which returns indices for use indexing into an [`ndarray`][@stdlib/ndarray/ctor] having a specified `shape`. ```javascript var array = require( '@stdlib/ndarray-array' ); var x = array( [ [ [ 1, 2 ], [ 3, 4 ] ], [ [ 5, 6 ], [ 7, 8 ] ] ] ); // returns <ndarray> var iter = nditerIndices( x.shape ); var v = iter.next().value; // returns [ 0, 0, 0 ] v = iter.next().value; // returns [ 0, 0, 1 ] v = iter.next().value; // returns [ 0, 1, 0 ] // ... ``` The function accepts the following `options`: - **order**: index iteration order. By default, the returned [iterator][mdn-iterator-protocol] iterates over the last dimensions first, thus corresponding to iteration over contiguous data stored in row-major order. Must be either `'row-major'` or `'column-major'`. By default, the iterator returns indices such that the last dimensions are iterated over first. To return indices according to a specified order, set the `order` option. ```javascript var array = require( '@stdlib/ndarray-array' ); var x = array( [ [ [ 1, 2 ], [ 3, 4 ] ], [ [ 5, 6 ], [ 7, 8 ] ] ], { 'order': 'row-major' }); // returns <ndarray> var iter = nditerIndices( x.shape, { 'order': 'column-major' }); var v = iter.next().value; // returns [ 0, 0, 0 ] v = iter.next().value; // returns [ 1, 0, 0 ] v = iter.next().value; // returns [ 0, 1, 0 ] // ... ``` The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties: - **next**: function which returns an [iterator][mdn-iterator-protocol] protocol-compliant object containing the next iterated value (if one exists) assigned to a `value` property and a `done` property having a `boolean` value indicating whether the [iterator][mdn-iterator-protocol] is finished. - **return**: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object. </section>   <section class="notes"> ## Notes - If an environment supports `Symbol.iterator`, the returned iterator is iterable. </section>   <section class="examples"> ## Examples  ```javascript var array = require( '@stdlib/ndarray-array' ); var zeroTo = require( '@stdlib/array-base-zero-to' ); var nditerIndices = require( '@stdlib/ndarray-iter-indices' ); // Define an input array: var x = array( zeroTo( 27 ), { 'shape': [ 3, 3, 3 ] }); // Create an iterator for generating indices: var it = nditerIndices( x.shape ); // Perform manual iteration... var v; while ( true ) { v = it.next(); if ( v.done ) { break; } console.log( x.get.apply( x, v.value ) ); } ``` </section>   <section class="references"> </section>   <section class="related"> * * * ## See Also - <span class="package-name">[`@stdlib/ndarray-ctor`][@stdlib/ndarray/ctor]</span><span class="delimiter">: </span><span class="description">multidimensional array constructor.</span> - <span class="package-name">[`@stdlib/ndarray-iter/entries`][@stdlib/ndarray/iter/entries]</span><span class="delimiter">: </span><span class="description">create an iterator which returns \[index, value] pairs for each element in a provided ndarray.</span> - <span class="package-name">[`@stdlib/ndarray-iter/values`][@stdlib/ndarray/iter/values]</span><span class="delimiter">: </span><span class="description">create an iterator which returns individual elements from a provided ndarray.</span> </section>   <section class="main-repo" > * * * ## Notice This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more. For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors]. </section>   <section class="links"> [npm-image]: http://img.shields.io/npm/v/@stdlib/ndarray-iter-indices.svg [npm-url]: https://npmjs.org/package/@stdlib/ndarray-iter-indices [test-image]: https://github.com/stdlib-js/ndarray-iter-indices/actions/workflows/test.yml/badge.svg?branch=v0.2.4 [test-url]: https://github.com/stdlib-js/ndarray-iter-indices/actions/workflows/test.yml?query=branch:v0.2.4 [coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/ndarray-iter-indices/main.svg [coverage-url]: https://codecov.io/github/stdlib-js/ndarray-iter-indices?branch=main  [chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg [chat-url]: https://stdlib.zulipchat.com [stdlib]: https://github.com/stdlib-js/stdlib [stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors [umd]: https://github.com/umdjs/umd [es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules [deno-url]: https://github.com/stdlib-js/ndarray-iter-indices/tree/deno [deno-readme]: https://github.com/stdlib-js/ndarray-iter-indices/blob/deno/README.md [umd-url]: https://github.com/stdlib-js/ndarray-iter-indices/tree/umd [umd-readme]: https://github.com/stdlib-js/ndarray-iter-indices/blob/umd/README.md [esm-url]: https://github.com/stdlib-js/ndarray-iter-indices/tree/esm [esm-readme]: https://github.com/stdlib-js/ndarray-iter-indices/blob/esm/README.md [branches-url]: https://github.com/stdlib-js/ndarray-iter-indices/blob/main/branches.md [stdlib-license]: https://raw.githubusercontent.com/stdlib-js/ndarray-iter-indices/main/LICENSE [mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol [@stdlib/ndarray/ctor]: https://www.npmjs.com/package/@stdlib/ndarray-ctor  [@stdlib/ndarray/iter/entries]: https://www.npmjs.com/package/@stdlib/ndarray-iter-entries [@stdlib/ndarray/iter/values]: https://www.npmjs.com/package/@stdlib/ndarray-iter-values  </section>