Insert a string at a specific index

Question

How can I insert a string at a specific index of another string?

 var txt1 = \"foo baz\"

Suppose I want to insert \"bar \" after the \"foo

Answer 1

Given your current example you could achieve the result by either

var txt2 = txt1.split(' ').join(' bar ')

or

var txt2 = txt1.replace(' ', ' bar ');

but given that you can make such assumptions, you might as well skip directly to Gullen's example.

In a situation where you really can't make any assumptions other than character index-based, then I really would go for a substring solution.