A for loop without any {}

Question

So I was reading about shuffling an array. And then I came across this script:

shuffle = function(o){ //v1.0
    for(var j, x, i = o.length; i; j = parseInt(         


        

Answer 1

Every computing is in same statement for single statement we dont need {} but also in this statement ; (sentence terminator is used in the end) it means next statement does not belong to for statement. Whatever logic is it is in same for statement.

  for(var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);


  for(var j, x, i = o.length;// Initialization
  i;// Work until i is zero
 j = parseInt(Math.random() * i),
  x = o[--i], o[i] = o[j], o[j] = x);//Here he is    computing his logic