indexed-filter

indexed-filter

Array#filter with also detecting indexes of filtered values

const arr = [1, 'foo', 2, 'bar'];

arr.filter(v => typeof v === 'string');
//=> ['foo', 'bar']

indexedFilter(arr, v => typeof v === 'string');
//=> [{index: 1, value: 'foo'}, {index: 3, value: 'bar'}]

Installation

Package managers

npm

npm install indexed-filter

Bower

bower install indexed-filter

Standalone

Download the script file directly.

API

indexedFilter(array, filterFn [, thisObject])

array: Array
filterFn: Function
thisObject: (Any value)
Return: Array

The API is vely similar to ECMAScript's built-in Array#filter. There are only two differences:

• You pass in the array as the first argument instead of calling the .filter() method on the array instance.
• Each filtered result is an object with tow properties, index (array index) and value (array element).

indexedFilter([0, [1], [2], '3', [5]], function(val, index, arr) {
  return this.isArray(val) && index % 2 === 0 && index < arr.length * 0.5;
}, Array);
//=> [{index: 2, value: [2]}]

License

Copyright (c) 2015 Shinnosuke Watanabe

Licensed under the MIT License.