For Loop

The easiest form of a loop is the for statement. This one has a syntax that is similar to an if statement, but with more options:

  1. for (condition; end condition; change) {
  2.     // do it, do it now
  3. }

Lets for example see how to execute the same code ten-times using a for loop:

  1. for (var i = 0; i < 10; i = i + 1) {
  2.   // do this code ten-times
  3. }

Note: i = i + 1 can be written i++.

{% exercise %} Using a for-loop, create a variable named message that equals the concatenation of integers (0, 1, 2, …) from 0 to 99. {% initial %} var message = “”; {% solution %} var message = “”;

for(var i = 0; i < 100; i++){ message = message + i; } {% validation %} var message2 = “”

for(var i = 0; i < 100; i++){ message2 = message2 + i; } assert(message === message2); {% endexercise %}