Compare 2 array's elements against each other and return count JavaScript

Question

I have 2 arrays that I need to compare against each other and return the count of the same.

Example: compare array1 [abcd] against array2 [adce]. Return would be 2,1

Answer 1

There is a JS library UnderscoreJS which provides a number of useful method for processing JavaScript arrays. You can use its difference method:

_.difference(['a','b','c','d'], ['a','d','c','e']) // returns ["b"]