Determining whether one array contains the contents of another array in JavaScript/CoffeeScript

Question

In JavaScript, how do I test that one array has the elements of another array?

arr1 = [1, 2, 3, 4, 5]
[8, 1, 10, 2, 3, 4, 5, 9].function_name(arr1) # => t         


        

Answer 1

ES6 solution using includes:

[1].every(elem => [1,2,3].includes(elem));

Very similar to Explosion Pills's solution above, just a bit more readable (and arguably a tiny, tiny bit slower).