Learn Javascript in 60 minutes - How to use functions in Javascript?

What is a Function in Javascript?
In Javascript, a function allows you to define a block of code, give the function a name and then execute it as many times as you want.
A javascript function can be defines using function keyword.

Syntax:
//function declaration
function functionname(parameter-list) {
statements
}
functionname(parameter-list ); //function call