All javascript methods have a return value???

Answer 1

Every function in JavaScript is a Function object. A function without a return statement will return a default value. In the case of a constructor called with the new keyword, the default value is the value of its this parameter. For all other functions, the default return value is undefined .

Answer 2

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions

Answer 3

of course.

undefined

even if you don't use "return" word

Answer 4

SAN I think is better with sample code

function awesome() {}

var obj = new awesome();
var a = awesome();

"obj" has value, an instance of awesome (internally this)
"a" value is undefined.