array-find-index
v1.0.2 es2015 ponyfill polyfill shim find index findindex array
array-find-index 
ES2015
Array#findIndex()ponyfill
Install
$ npm install --save array-find-index
Usage
const arrayFindIndex = require('array-find-index');
arrayFindIndex(['rainbow', 'unicorn', 'pony'], x => x === 'unicorn');
//=> 1
API
Same as Array#findIndex(), but with the input array as the first argument.
License
MIT © Sindre Sorhus
