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Asked: 2026-06-02T20:39:15+00:00

I’ve come across someone’s old code that has variables identified like: @user_id@, @reference_id@, and

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I’ve come across someone’s old code that has variables identified like: @user_id@, @reference_id@, and so forth. Wikipedia says “In certain JavaScript implementations, the at sign (@) can be used in an identifier…” In what JS implementations does this work? I can’t get it to work.

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  1. Editorial Team

    This is totally valid:

    var π = Math.PI;

    This does not appear to be valid:

    var @yourName = "Jamund";

    This works though:

    var $yourName = "Jamund";

    If you’re bored and want to learn all of the gory details:
    http://mathiasbynens.be/notes/javascript-identifiers

    As for your specific problem, yeah it’s probably either in a comment (JavaDoc uses @ in its comments and sometimes it’s style has been used in JS comments) or it was meant to be processed and replaced server-side.

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