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