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Javascript Tutorial: Loops and FunctionsHome > Build > Programming > Javascript > Javascript Tutorial Loops are pretty much what you would guess; they are used to repeat certain statements for a specified number of times. Loops can make the length of script decrease tremendously in size, thus saving you lots of time and effort. THE for LOOP For
loops are used to repeat certain statements a specified number
of times using a counter. Usually this counter is a number
and has one added to it or taken away from it each time the
loop executes. Time for an example.....
for (i = 1; i <= 5; i++){ }
Let's analyze what this script actually does. The loop is started by the for keyword and then it establishes a variable (the counter), the value to test the variable with, and how the variable is to be changed each time the loop executes and it also contains braces around the statements that are to be executed. In simpler terms, this script executes 5 times with value of i having one added to eat each time the loop executes. You use the same operators you used in the last chapter to compare values. The result of the script would be 5 messages with a line break after each. It would appear like the following. Test message #1 Test message #2 Test message #3 Test message #4 Test message #5 THE while LOOP While
loops are usually used when you don't have a counter.
var i = 1; while (i <= 5){ } This would achieve the same affect as the for loop above. Like I mentioned, you don't have a counter with while loops. THE do...while LOOP do
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