Function calling in Javascript with double brackets

Question

When I call function hi()() with double brackets the function displays hi output and it will also give error saying, that hi is not functi

Answer 1

The return value of this function is a string which is not a callable object.

function hi()
{
    document.write("hi");
    return "hello"; // <-- returned value
}

But if you want to call this function multiple times you can use a for-loop or some things else.

Example of hi()():

function hi(){
    return function(){ // this anonymous function is a closure for hi function
       alert('some things')
    }
}

JS Fiddle: here

If you want to call hello function immediately after hi try this:

 function hi()
    {
        document.write("hi");
        return hello; //<-- no quote needed
        // In this context hello is function object not a string
    }