Scripter Javascript Tutorial

66 The `for` Statement

The for statement is the most commonly used. It executes a block of code until a condition is false. The for statement has the following syntax:

for ( <initialize>; <condition>; <increment> ) {
	// code block to do something
}

In the above example:

Line 1: The statement is declared with for and there are three statements which affect the loop:
- Initialize executes once at the beginning of the loop. This initializes a variable which works within the loop to help manage code execution and is used to test whether the loop’s condition is still true.
- Condition is the statement which needs to be true for the loop to continue running. Once the condition is false, the loop immediately stops and the script moves on to any subsequent code.
- Increment updates the loop’s variable and is executed after the code block within the loop has been executed.
Line 2: This contains the code (of any length) to be executed within the loop. A break statement may also be added to stop the loop early, just like in the switch statement.