function bounce(progress) {
02
  for (var a = 0, b = 1, result; 1; a += b, b /= 2) {
03
    if (progress >= (7 - 4 * a) / 11) {
04
      return -Math.pow((11 - 6 * a - 11 * progress) / 4, 2) + Math.pow(b, 2);
05
    }
06
  }
07
}
08
 
09
function makeEaseOut(delta) {  // преобразовать delta
10
  return function(progress) {
11
    return 1 - delta(1 - progress);
12
  }
13
}
14
 
15
var bounceEaseOut = makeEaseOut(bounce);