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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.


while (condition);
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.
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.


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.

HTML Content

<div id="example"></div>

JavaScript Content

var result = '';
var i = 0;
do {
   i += 1;
   result += i + ' ';
} while (i < 5);
document.getElementById('example').innerHTML = result;



Specification Status Comment
ECMAScript 3rd Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.2
ECMAScript 5.1 (ECMA-262)
The definition of 'do-while statement' in that specification.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'do-while statement' in that specification.
Standard Trailing ; is now optional.
ECMAScript Latest Draft (ECMA-262)
The definition of 'do-while statement' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes Yes6 Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes ?

See also

Document Tags and Contributors

 Last updated by: schalkneethling,