Question

Is it possible to replace the a character at a particular position with a string

Let us say there is say a string : "I am a man"

I want to replace character at 7 with the string "wom" (regardless of what the original character was).

The final result should be : "I am a woman"

Answer 1

Strings are immutable in Javascript – you can’t modify them “in place”.

You’ll need to cut the original string up, and return a new string made out of all of the pieces:

// replace the 'n'th character of 's' with 't'
function replaceAt(s, n, t) {
    return s.substring(0, n) + t + s.substring(n + 1);
}

NB: I didn’t add this to String.prototype because on some browsers performance is very bad if you add functions to the prototype of built-in types.