Javascript Delete items from array that exists in another array without mutating for reducers

Question

I have following two arrays

let a = ["Hello", "bye", "good morning", "test"];
let b = ["Hello", "test"];

How can i delete items that exists in array b from array a(without mutation)? The resultant array should look like:-

["bye", "good morning"];

Please specify: is `["bye", "good morning"]` the final value in a, or a new array c. "Resultant" implies c, but "delete" implies a. — subdavis, Apr 06 '17 at 18:55
have you looked into the underscore.js library. There are very useful method there! — funcoding, Apr 06 '17 at 18:57
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter — epascarello, Apr 06 '17 at 18:58

score 3 · Accepted Answer · answered Apr 06 '17 at 19:02

3

filter() and some()

let a = ["Hello", "bye", "good morning", "test"],
    b = ["Hello", "test"],
    c = a.filter( e => !b.some( i => i===e))

answered Apr 06 '17 at 19:02

epascarello

1 Answers1