JavaScript method, sans jQuery, for a cubic ease-out function

easeoutcubic.js

/*
 * Robert Penner's algorithm for an cubic ease out function
 * @param  {Number} currentIteration The current iteration of the animation, on each subsequent
 *                                   call this should be increased by 1
 * @param  {Number} startValue       The start value, this should be a constant throughout the
 *                                   animation.
 * @param  {Number} changeInValue    The difference between the start value and the desired end value
 * @param  {Number} totalIterations  The number of iterations over which we want to go from start
 *                                   to end
 * @return {Number}                  The value for the current step in the animation
 */
function easeOutCubic (currentIteration, startValue, changeInValue, totalIterations) {
	return changeInValue * (Math.pow(currentIteration / totalIterations - 1, 3) + 1) + startValue;
}