do...while

The do...while statement creates a loop that executes a specified statement until the test condition evaluates to false. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once.

Syntax

do
   statement
while (condition);
statement
A statement that is executed at least once and is re-executed each time the condition evaluates to true. To execute multiple statements within the loop, use a block statement ({ ... }) to group those statements.
condition
An expression evaluated after each pass through the loop. If condition evaluates to true, the statement is re-executed. When condition evaluates to false, control passes to the statement following the do...while.

Examples

Using do...while

In the following example, the do...while loop iterates at least once and reiterates until i is no longer less than 5.

var result = '';
var i = 0;
do {
   i += 1;
   result += i + ' ';
}
while (i > 0 && i < 5);
// Despite i == 0 this will still loop as it starts off without the test

console.log(result);

Specifications

Specification
ECMAScript (ECMA-262)
The definition of 'do-while statement' in that specification.

Browser compatibility

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See also