111 lines
5.1 KiB
Markdown
111 lines
5.1 KiB
Markdown
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# es-iterator-helpers <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![github actions][actions-image]][actions-url]
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[![coverage][codecov-image]][codecov-url]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][npm-badge-png]][package-url]
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An ESnext spec-compliant sync iterator helpers shim/polyfill/replacement that works as far down as ES3.
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This package implements the [es-shim API](https://github.com/es-shims/api) “multi” interface. It works in an ES3-supported environment and complies with the [iterator helpers spec](https://tc39.es/proposal-iterator-helpers/) and the [iterator sequencing spec](https://tc39.es/proposal-iterator-sequencing/).
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Because the `Iterator.prototype` methods depend on a receiver (the `this` value), the main export in each subdirectory takes the iterator to operate on as the first argument.
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The main export of the package itself is simply an array of the available directory names. It’s sole intended use is for build tooling and testing.
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## Supported things
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- [`Iterator` constructor](https://tc39.es/proposal-iterator-helpers/#sec-iterator-constructor)
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- [`Iterator.prototype`](https://tc39.es/proposal-iterator-helpers/#sec-iterator.prototype)
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- [`Iterator.concat`](https://tc39.es/proposal-iterator-sequencing/)
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- [`Iterator.from`](https://tc39.es/proposal-iterator-helpers/#sec-iterator.from)
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- [`Iterator.zip`](https://tc39.es/proposal-joint-iteration/#sec-iterator.zip)
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- [`Iterator.zipKeyed`](https://tc39.es/proposal-joint-iteration/#sec-iterator.zipkeyed)
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- [`Iterator.prototype.constructor`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.constructor)
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- [`Iterator.prototype.drop`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.drop)
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- [`Iterator.prototype.every`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.every)
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- [`Iterator.prototype.filter`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.filter)
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- [`Iterator.prototype.find`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.find)
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- [`Iterator.prototype.flatMap`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.flatmap)
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- [`Iterator.prototype.forEach`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.foreach)
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- [`Iterator.prototype.map`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.map)
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- [`Iterator.prototype.reduce`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.reduce)
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- [`Iterator.prototype.some`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.some)
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- [`Iterator.prototype.take`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.take)
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- [`Iterator.prototype.toArray`](https://tc39.es/proposal-iterator-helpers/#sec-iteratorprototype.toarray)
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## Environments where this is needed
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- node v22, Chrome >= v122: has a [bug](https://issues.chromium.org/issues/336839115)
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- node < v22, Chrome < v122, Safari <= v17.1, Firefox <= v125: not implemented
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- all environments lack Iterator.concat, Iterator.zip, Iterator.zipKeyed
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## Getting started
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```sh
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npm install --save es-iterator-helpers
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```
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## Usage/Examples
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Using explicit imports:
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```js
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const map = require('es-iterator-helpers/Iterator.prototype.map');
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const toArray = require('es-iterator-helpers/Iterator.prototype.toArray');
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const assert = require('assert');
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const iterator = [1, 2, 3].values();
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const mapped = map(iterator, (x) => x + 10);
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assert.deepEqual(
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mapped.next(),
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{
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done: false,
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value: 11,
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}
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);
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assert.deepEqual(
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toArray(mapped),
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[12, 13]
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);
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```
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Shim using `require`:
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```js
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require('es-iterator-helpers/auto'); // shim all of the methods
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require('es-iterator-helpers/Iterator.prototype.map/auto'); // shim the “map” method
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```
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Shim using `import` syntax:
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[](#preventEval)
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```js
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import 'es-iterator-helpers/auto'; // shim all of the methods
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import 'es-iterator-helpers/Iterator.prototype.map/auto'; // shim the “map” method
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```
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[package-url]: https://npmjs.org/package/es-iterator-helpers
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[npm-version-svg]: https://versionbadg.es/es-shims/iterator-helpers.svg
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[deps-svg]: https://david-dm.org/es-shims/iterator-helpers.svg
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[deps-url]: https://david-dm.org/es-shims/iterator-helpers
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[dev-deps-svg]: https://david-dm.org/es-shims/iterator-helpers/dev-status.svg
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[dev-deps-url]: https://david-dm.org/es-shims/iterator-helpers#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/es-iterator-helpers.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/es-iterator-helpers.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/es-iterator-helpers.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=es-iterator-helpers
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[codecov-image]: https://codecov.io/gh/es-shims/iterator-helpers/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/es-shims/iterator-helpers/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/iterator-helpers
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[actions-url]: https://github.com/es-shims/iterator-helpers/actions
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