do...while Statement

Executes a statement block once, and then repeats execution of the loop until a conditional expression evaluates to false.

do 
   statement 
while (expression)

Arguments

• statement
  Required. Statement to be executed if expression is true. Can be a compound statement.

• expression
  Required. An expression that can be coerced to Boolean true or false. If expression is true, the loop is executed again. If expression is false, the loop is terminated.

Remarks

Unlike the while statement, a do...while loop is executed one time before the conditional expression is evaluated.

On any line in a do…while block, you can use the break statement to cause the program flow to exit the loop, or you can use the continue statement to go directly to the while expression.

Example

In the following example, the statements in the do...while loop execute as long as the variable i is less than 10.

var s = "";

var i = 0;
do
{
    s +=  i + " ";
    i++;
} while (i < 10);

print (s);
// Output: 0 1 2 3 4 5 6 7 8 9 

Requirements

Version 3

See Also

Reference

break Statement

continue Statement

for Statement

for...in Statement

while Statement

Labeled Statement

Change History

Date	History	Reason
July 2009	Modified example.	Content bug fix.
March 2009	Modified remarks and example.	Information enhancement.