How do I test if one array is a subset of another? [closed]

Answer 1

Maybe difference is what you are looking for:

_(hand).difference(colors).length === 0

Answer 2

Assuming each element in the array is unique: Compare the length of hand with the length of the intersection of both arrays. If they are the same, all elements in hand are also in colors.

var result = (hand.length === _.intersection(hand, colors).length);

DEMO