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