@extra-array/find-index

Finds index of leftmost value passing a test. [:running:] [:vhs:] [:package:] [:moon:] [:ledger:]
> Alternatives: [findIndex], [findIndices].

> Similar: [find], [findIndex].

> This is part of package [extra-array].

[extra-array]: https://www.npmjs.com/package/extra-array

``javascript
array.findIndex(x, fn);
// x: an array
// fn: test function (v, i, x)
// --> index of value, -1 if not found
`

`javascript
const array = require('extra-array');

var x = [1, 2, 3, 4, 5];
array.findIndex(x, v => v % 2 == 0);
// 1 ^

array.findIndex(x, v => v % 2 == 1);
// 0 ^
``

$3

- Data.List.findIndex: Haskell
- List-Extra.findIndex: elm
- _.findIndex: lodash
- Array.findIndex: sugarjs

[:running:]: https://npm.runkit.com/@extra-array/find-index
[:package:]: https://www.npmjs.com/package/@extra-array/find-index
[:moon:]: https://www.npmjs.com/package/@extra-array/find-index.min
[:ledger:]: https://unpkg.com/@extra-array/find-index/
[findIndex]: https://github.com/nodef/extra-array/wiki/findIndex
[findIndices]: https://github.com/nodef/extra-array/wiki/findIndices
[find]: https://github.com/nodef/extra-array/wiki/find
[:vhs:]: https://asciinema.org/a/332048