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 08:12

    You can't. Take the characters before and after the position and concat into a new string:

    var s = "Hello world";
    var index = 3;
    s = s.substring(0, index) + 'x' + s.substring(index + 1);
    

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