finds an item in an array matching a predicate function, and returns its index. 

finds an item in an array matching a predicate function, and returns its index

jsdf

find-index

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  "description": "finds an item in an array matching a predicate function, and returns its index",

  "homepage": "https://github.com/jsdf/find-index",

  "bugs": "https://github.com/jsdf/find-index/issues",

    "url": "git://github.com/jsdf/find-index.git"

  "author": "James Friend <james@jsdf.co> (http://jsdf.co/)",

ES6 `Array#findIndex` as a standalone module and a **ponyfill** (a polyfill that 

An implementation of the ES6 method `Array.prototype.findIndex` as a standalone module and a 

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)

Fast both when `thisArg` is used and also when it isn't.

var findIndex = require('find-index/findIndex')

var findIndex = require('find-index/ponyfill') // will use native Array#findIndex if available.

var findLastIndex = require('find-index/findLastIndex') // search backwards from end

    findIndex(array, callback[, thisArg])

    findLastIndex(array, callback[, thisArg])

        Function to execute on each value in the array, taking three arguments:

            The current element being processed in the array.

            The index of the current element being processed in the array.

            The array findIndex was called upon.

        Object to use as this when executing callback.

Based on [array-findindex](https://www.npmjs.org/package/array-findindex)

$ iojs --harmony_arrays perf/benchmark.js

		{
		"name": "find-index",
		"version": "1.1.0",
		"version": "1.1.1",
		"description": "finds an item in an array matching a predicate function, and returns its index",
		@@ -20,3 +20,3 @@ "main": "index.js",
		"array-findindex": "0.1.0",
		"lodash.findindex": "3.2.0",
		"lodash.findindex": "^4.6.0",
		"tap": "^1.0.4"
		@@ -23,0 +23,0 @@ },

Improved metrics

Worsened metrics


		# find-index

		ES6 `Array#findIndex` as a standalone module and a ponyfill (a polyfill that
		doesn't overwrite the native method).
		An implementation of the ES6 method `Array.prototype.findIndex` as a standalone module and a
		[ponyfill](https://ponyfill.com).

		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)
		Fast both when `thisArg` is used and also when it isn't.

		@@ -43,3 +42,3 @@ ### usage

		```js
		```bash
		$ iojs --harmony_arrays perf/benchmark.js
		@@ -46,0 +45,0 @@