Selected a random number from a set

Question

I want to select a random number out of a set. For example from the set {8, 6, 1, 7}.

Answer 1

You can use following function to get a random number out of a set:

function getRndmFromSet(set)
{
    var rndm = Math.floor(Math.random() * set.length);
    return set[rndm];
}

in your case the call would be getRndmFromSet([8,6,1,7])

Try the jsFiddle

Note: if your "set" is actually a Set object and not an array, you'd use .size instead of .length.