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Creates a loop of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a block of statements executed in the loop.
Syntax
for ( [initial-expression]; [condition]; [increment-expression])
{
statements
}
Parameters
| Parameter | Description |
|---|---|
| initial-expression | Statement or variable declaration. Typically used to initialize a counter variable. This expression may optionally declare new variables with the var keyword. These variables are local to the function, not to the loop. |
| condition | Evaluated on each pass through the loop. If this condition evaluates to true, the statements in statements are performed. This conditional test is optional. If omitted, the condition always evaluates to true. |
| increment-expression | Generally used to update or increment the counter variable. |
| statements | Block of statements that are executed as long as condition evaluates to true. This can be a single statement or multiple statements. Although not required, it is good practice to indent these statements from the beginning of the for statement. |
Examples
The following for statement starts by declaring the variable i and initializing it to 0. It checks that i is less than nine, performs the two succeeding statements, and increments i by 1 after each pass through the loop.