How do I replace a character at a particular index in JavaScript?

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孤城傲影
孤城傲影 2020-11-21 07:23

I have a string, let\'s say Hello world and I need to replace the char at index 3. How can I replace a char by specifying a index?

var str = \"h         


        
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  •  长发绾君心
    2020-11-21 08:03

    Lets say you want to replace Kth index (0-based index) with 'Z'. You could use Regex to do this.

    var re = var re = new RegExp("((.){" + K + "})((.){1})")
    str.replace(re, "$1A$`");
    

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