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']),