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    length

    Summary

    The length property represents the length of a string.

    Description

    This property returns the number of code units in the string. UTF-16, the string format used by JavaScript, uses a single 16-bit code unit to represent the most common characters, but needs to use two code units for less commonly-used characters, so it's possible for the value returned by length to not match the actual number of characters in the string.

    For an empty string, length is 0.

    The static property String.length returns the value 1.

    Examples

    var x = "Mozilla";
    var empty = "";
    
    console.log("Mozilla is " + x.length + " code units long");
    /* "Mozilla is 7 code units long" */
    
    console.log("The empty string is has a length of " + empty.length);
    /* "The empty string is has a length of 0" */

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Standard Initial definition.
    Implemented in JavaScript 1.0
    ECMAScript 5.1 (ECMA-262)
    The definition of 'String.prototype.length' in that specification.
    Standard  
    ECMAScript 6 (ECMA-262)
    The definition of 'String.prototype.length' in that specification.
    Draft  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (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

    Contributors to this page: Sevenspade
    Last updated by: Sevenspade,
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