doing-things-in-a-loop.md

Repeating Code in a Loop

If you want to repeat code, then you would use a loop.

For Loop

If you want to do something a set amount of times, use a for loop.

i is the name for our counter. The counter starts at zero and increases by one every time it completes a loop.

for (var i = 0; i < 3; i++) {
  alert("Loop number " + i);
}

While Loop

If you want to keep something running until something changes, use a while loop.

var i = true;
while (i) {
  i = false;
}

Beware of the infinite loop

var i = true;
while (i) {
  // this will never stop repeating
  i = true;
}