Question

How to replace substring in string by index in JavaScript

Answer 1

String.prototype.replaceAt=function(index, ch) {
    return this.substr(0, index) + ch + this.substr(index + ch.length);
}
   
s = "abcd"; 

s = s.replaceAt(1, "XY");

document.write(s);  
 


/*
run:
    
aXYd 
    
*/

 

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