ES6 Array.prototype.findIndex polyfill

Simple ES6 Array.prototype.findIndex polyfill for older environments taken from es6-shim.

For browsers and node.js.

• Just include repo before your scripts.
• npm install array.prototype.findindex if you’re using node.js.
• component install paulmillr/Array.prototype.findIndex if you’re using component(1).
• bower install Array.prototype.findIndex if you’re using Twitter Bower.

• Array.prototype.findIndex(predicate[, thisArg]) returns first item index that matches predicate function.
• predicate(value, index, collection): takes three arguments
  • value: current collection element
  • index: current collection element index
  • collection: the collection

var findIndex = require('array.prototype.findindex');

findIndex.shim(); // if you want to install it on the global environment

Code example:

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

The MIT License (MIT)

Copyright (c) 2013 Paul Miller http://paulmillr.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.