jQuery pick a random value from a array of strings

Question

I know how do this in PHP, but in javascript arrays are weird.

So I have a set of image transitions which have effects that use easing equations. For certain effects I want to pick up a random value from a array of multiple values:

something like:

easing: randomFrom(array('easeOutElastic', 'easeOutBounce', 'easeOutSince')),

Answer 1

function randomFrom(array) {
  return array[Math.floor(Math.random() * array.length)];
}

// in your code
easing: randomFrom(['easeOutElastic', 'easeOutBounce', 'easeOutSince']),

Answer 2

Try this:

function randomFrom(arr){
    var randomIndex = Math.floor(Math.random() * arr.length);
    return arr[randomIndex];
}