Return statements at the end of a JavaScript function

Question

I have seen in many times in JavaScript code people add a return true at the end although not necessary. Does anyone know why?

var _globalString;
function doSomething()
{
    _globalString= _globalString +' do something';
    //some codes to do something more

    //finally adding a return true
    return true;
}

Answer 1

The thing that may have gotten some people into the habit was event handlers for forms, if you have, say:

<form onsubmit="return myfunction();">

and myfunction() returns true, the form submits, else if it returns false it doesn't. People doing it in general could've got the habit from this. Some languages require return values from functions, Javascript doesn't; and having return true at the end of most functions serves no purpose.

Answer 2

In addition to Erik's answer I would like to add

return true / return false are also used when you want boolean value as a return. And based on that return you execute some other function.