Using .replace() at a specific index

Question

Is there a function that can replace a string within a string once at a specific index? Example:

var string1="my text is my text";
var string2="my";
string1.replaceAt(string2,"your",10);

and the resultant output would be "my text is your text", Or:

var string1="my text is my text";
var string2="my";
string1.replaceAt(string2,"your",0);

in which case the result would be "your text is my text".

Answer 1

function ReplaceAt(input, search, replace, start, end) {
    return input.slice(0, start)
        + input.slice(start, end).replace(search, replace)
        + input.slice(end);
}

jsfiddle here

PS. modify the code to add empty checks, boundary checks etc.