Finding matches between multiple JavaScript Arrays
- by Chris Barr
I have multiple arrays with string values and I want to compare them and only keep the matching results that are identical between ALL of them.
Given this example code:
var arr1 = ['apple', 'orange', 'banana', 'pear', 'fish', 'pancake', 'taco', 'pizza'];
var arr2 = ['taco', 'fish', 'apple', 'pizza'];
var arr3 = ['banana', 'pizza', 'fish', 'apple'];
I would like to to produce the following array that contains matches from all given arrays:
['apple', 'fish', 'pizza']
I know I can combine all the arrays with var newArr = arr1.concat(arr2, arr3); but that just give me an array with everything, plus the duplicates. Can this be done easily without needing the overhead of libraries such as underscore.js?
(Great, and now i'm hungry too!)
EDIT I suppose I should mention that there could be an unknown amount of arrays, I was just using 3 as an example.
