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JavaScript do...while Loop

Example

Execute a code block once, an then continue if condition (i < 5) is true:

let text = "";
let i = 0;
do {
  text += i + "<br>";
  i++;
}
while (i < 5);
Try it Yourself »

Definition and Usage

The do...while statements combo defines a code block to be executed once, and repeated as long as a condition is true.

The do...while is used when you want to run a code block at least one time.

Note

If you use a variable in the condition, you must initialize it before the loop, and increment it within the loop. Otherwise the loop will never end. This will crash your browser.

If the condition is always true, the loop will never end. This will also crash your browser.

See Also:

The JavaScript While Loop Tutorial


Syntax

do {
  code block to be executed
}
while (condition);

Parameters

Parameter Description
condition Required.
The condition for running the code block.
If true, the loop will start over again, otherwise it ends.


JavaScript Loop Statements

StatementDescription
breakBreaks out of a loop
continueSkips a value in a loop
whileLoops a code block while a condition is true
do...whileLoops a code block once, and then while a condition is true
forLoops a code block while a condition is true
for...ofLoops the values of any iterable
for...inLoops the properties of an object

Browser Support

do..while is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:

Chrome IE Edge Firefox Safari Opera
Yes Yes Yes Yes Yes Yes