How can I check for an empty/undefined/null string in JavaScript?

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长发绾君心
长发绾君心 2020-11-21 23:47

I saw this question, but I didn\'t see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it just a case of checking f

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  •  心在旅途
    2020-11-22 00:19

    If one needs to detect not only empty but also blank strings, I'll add to Goral's answer:

    function isEmpty(s){
        return !s.length;    
    }
    
    function isBlank(s){
        return isEmpty(s.trim());    
    }
    

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