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Home/ Questions/Q 214057
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Editorial Team
Asked: May 11, 20262026-05-11T18:20:16+00:00 2026-05-11T18:20:16+00:00

How can i concatenate var names to declare new vars in javascript?: var foo

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How can i concatenate var names to declare new vars in javascript?:

var foo = 'var';
var bar = 'Name';

How can i declare variable varName?

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  1. Editorial Team
    Editorial Team
    2026-05-11T18:20:17+00:00Added an answer on May 11, 2026 at 6:20 pm

    Try something like:

    window[foo + bar] = "whatever"; 
    alert(varName);
    

    do not use the eval function unless you are absolutely certain about what’s going in. window[] is much safer if all you’re doing is variable access

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