replace a string after specific index in javascript str.replace(from, to, indexfrom)

Question

I like to replace a string after a specific index.

ex:

var str = "abcedfabcdef"
    str.replace ("a","z",2)
    console.log(str) 
    abcedfzbcdef

Is there any way to do this in javascript or in nodeJS?

Answer 1

There is no direct way using the builtin replace function but you can always create a new function for that:

String.prototype.betterReplace = function(search, replace, from) {
  if (this.length > from) {
    return this.slice(0, from) + this.slice(from).replace(search, replace);
  }
  return this;
}

var str = "abcedfabcdef"
console.log(str.betterReplace("a","z","2"))