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# find-index
finds an item in an array matching a predicate function,
and returns its index
fast both when `thisArg` is used and also when it isn't: [jsPerf](http://jsperf.com/array-prototype-findindex-shims)
### usage
```bash
npm install find-index
```
```js
findIndex = require('find-index')
findLastIndex = require('find-index/last')
```
findIndex(array, callback[, thisArg])
findLastIndex(array, callback[, thisArg])
Parameters:
array
The array to operate on.
callback
Function to execute on each value in the array, taking three arguments:
element
The current element being processed in the array.
index
The index of the current element being processed in the array.
array
The array findIndex was called upon.
thisArg
Object to use as this when executing callback.
based on [array-findindex](https://www.npmjs.org/package/array-findindex)
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