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    String.prototype.concat()

    Summary

    The concat() method combines the text of two or more strings and returns a new string.

    Syntax

    str.concat(string2, string3[, ..., stringN])

    Parameters

    string2...stringN
    Strings to concatenate to this string.

    Description

    The concat() function combines the text from one or more strings and returns a new string. Changes to the text in one string do not affect the other string.

    Examples

    Example: Using concat()

    The following example combines strings into a new string.

    var hello = 'Hello, ';
    console.log(hello.concat('Kevin', ' have a nice day.'));
    
    /* Hello, Kevin have a nice day. */
    

    Performance

    It is strongly recommended that assignment operators (+, +=) are used instead of the concat() method. See this perfomance test.

    Specifications

    Specification Status Comment
    ECMAScript 3rd Edition. Standard Initial definition. Implemented in JavaScript 1.2.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'String.prototype.concat' in that specification.
    Standard  
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'String.prototype.concat' in that specification.
    Standard  

    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: Sheppy, fscholz, evilpie, Pointy, ziyunfei, ethertank, Mgjbot, Maian, Dria, Nfroidure, Mingun
    Last updated by: Mingun,
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