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for Statement

---

The for statement repeats a series of statements a fixed number of times.

Syntax

for ( [var] counter = start; condition; increment )

{

statement_block;

}

Placeholder	Description
counter	A numeric variable for the loop counter
start	The initial value of the counter
condition	The condition at which the loop should end
increment	The amount by which the counter is changed each time the loop is run
statement_block	The statements or methods to be executed

Returns

Not applicable

Usage

The counter variable must be declared with var if it has not already been declared. If it is declared in the for statement, its scope is local to the loop.

First, the expression counter = start is evaluated. Then condition is evaluated. If condition is true or if there is no conditional expression, the statement is executed. Then the increment is executed and condition is reevaluated, which begins the loop again. If the expression is false, the statement is not executed, and the program continues with the next line of code after the statement.

Within the loop, the value of counter should not be changed, because changing the counter makes your script difficult to maintain and debug.

A for statement can control multiple nested loops. The various counter variables and their increments must be separated by commas. For example:

for (var i = 1, var j = 3; i < 10; i++, j++)
   var result = i * j;

Example

For an example of the for statement, read eval() Method.

See Also

do...while Statement and while Statement

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