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Array.prototype.at

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An ES-spec-compliant (proposed) `Array.prototype.at`shim/polyfill/replacement that works as far down as ES3.

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# array.prototype.at <sup>[![Version Badge][npm-version-svg]][package-url]</sup>

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An ESnext spec-compliant `Array.prototype.at` shim/polyfill/replacement that works as far down as ES3.

This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the proposed [spec](https://github.com/tc39/proposal-relative-indexing-method).

Because `Array.prototype.at` depends on a receiver (the `this` value), the main export takes the array to operate on as the first argument.

## Getting started

```sh
npm install --save array.prototype.at
```

## Usage/Examples

```js
var at = require('array.prototype.at');
var assert = require('assert');

var arr = [1, [2], [], 3];

var results = at(arr, function (x, i) {
	assert.equal(x, arr[i]);
	return x;
});

assert.deepEqual(results, [1, 2, 3]);
```

```js
var at = require('array.prototype.at');
var assert = require('assert');
/* when Array#at is not present */
delete Array.prototype.at;
var shimmedAt = at.shim();

var mapper = function (x) { return [x, 1]; };

assert.equal(shimmedAt, at.getPolyfill());
assert.deepEqual(arr.at(mapper), at(arr, mapper));
```

```js
var at = require('array.prototype.at');
var assert = require('assert');
/* when Array#at is present */
var shimmedAt = at.shim();

var mapper = function (x) { return [x, 1]; };

assert.equal(shimmedAt, Array.prototype.at);
assert.deepEqual(arr.at(mapper), at(arr, mapper));
```

## Tests
Simply clone the repo, `npm install`, and run `npm test`

[package-url]: https://npmjs.org/package/array.prototype.at
[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.at.svg
[deps-svg]: https://david-dm.org/es-shims/Array.prototype.at.svg
[deps-url]: https://david-dm.org/es-shims/Array.prototype.at
[dev-deps-svg]: https://david-dm.org/es-shims/Array.prototype.at/dev-status.svg
[dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.at#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/array.prototype.at.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/array.prototype.at.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/array.prototype.at.svg
[downloads-url]: https://npm-stat.com/charts.html?package=array.prototype.at
[codecov-image]: https://codecov.io/gh/es-shims/Array.prototype.at/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/es-shims/Array.prototype.at/
[actions-image]: https://img.shields.io/github/check-runs/es-shims/Array.prototype.at/main
[actions-url]: https://github.com/es-shims/Array.prototype.at/actions

Array.prototype.at

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