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    do...while

    Summary

    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

    Example: 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 i = 0;
    do {
       i += 1;
       console.log(i);
    } while (i < 5);
    

    Specifications

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

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) IE6+ (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Last updated by: fscholz,
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