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

I know this is an old thread, however, here is a really effective approach.

var tn = document.createTextNode("I am just  to help")
t.insertData(10, "trying");

What's great about this is that it coerces the node content. So if this node were already on the DOM, you wouldn't need to use any query selectors or update the innerText. The changes would reflect due to its binding.

Were you to need a string, simply access the node's text content property.

tn.textContent
#=> "I am just trying to help"