https://github.com/bendingbender/mdn-array.prototype.findindex

MDN version of Array.prototype.findIndex shim
https://github.com/bendingbender/mdn-array.prototype.findindex

Last synced: 25 days ago
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MDN version of Array.prototype.findIndex shim

• Host: GitHub
• URL: https://github.com/bendingbender/mdn-array.prototype.findindex
• Owner: BendingBender
• License: cc0-1.0
• Created: 2016-08-03T08:17:10.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-05-11T19:42:41.000Z (over 7 years ago)
• Last Synced: 2024-11-20T18:11:55.458Z (about 1 month ago)
• Language: JavaScript
• Size: 7.81 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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[![browser support](https://ci.testling.com/BendingBender/MDN-Array.prototype.findIndex.png)](https://ci.testling.com/BendingBender/MDN-Array.prototype.findIndex)

[![Build Status](https://travis-ci.org/BendingBender/MDN-Array.prototype.findIndex.svg?branch=master)](https://travis-ci.org/BendingBender/MDN-Array.prototype.findIndex)

# ES6 `Array.prototype.findIndex` shim

Simple ES6 [Array.prototype.findIndex](https://tc39.github.io/ecma262/#sec-array.prototype.findindex) polyfill for older environments taken from [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex#Polyfill).

For browsers only, bower-friendly. Explicitly not meant to be used with node, use [Array.prototype.findIndex](https://github.com/paulmillr/Array.prototype.findIndex) if you wish a shim for node.

## Installation

* Just include repo before your scripts.

* `bower install mdn-array.prototype.findindex`

## Usage

* `Array.prototype.findindex(predicate[, thisArg])` returns first item index that matches `predicate` function.

#### Parameters

* `predicate(value, index, collection)`: takes three arguments

    * `value`: current collection element

    * `index`: current collection element index

    * `collection`: the collection

* `thisArg`: Optional. Object to use as `this` when executing `predicate`.

#### Code example

```javascript

[1, 5, 10, 15].findIndex(function(a) {return a > 9;}) // 2

```

## Acknowledgements

Tests, readme and travis support gratefully taken from [Array.prototype.findIndex](https://github.com/paulmillr/Array.prototype.findIndex)

## License

CC0 1.0