Question

How to replace multiple character at a specific index in a string with JavaScript

Answer 1

let str = "typescript php java c++";

const index = 3;
const replacement = 'UVW';

str = str.substring(0, index) + replacement + str.substring(index + replacement.length);
  
console.log(str); 
 
 
 
  
  
/*
run:
  
"typUVWript php java c++"
 
*/

 

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