Notes on the name of JavaScript syntax and also rules.

JavaScript Names and Rules

/* RULES */

- Variable and function declarations are hoisted (names are moved to the top of their current scope) by the JavaScript interpreter.
- Variable initialisations are not moved.
- Only functions create new scope
- Function Declarations are officially prohibited within non-function blocks (such as if) 

var a; // variable declaration
a = 1; // variable initialisation

- The function name (if any) of a function expression is not visible outside of it’s scope.
- The function name of a function declaration is visible within it’s scope and the scope of it’s parent
- Now in practice, generally you want to put your var declarations at the top of the function, since that is where they end up anyway.

/* NAMES */

Function Declaration
--------------------
function bar() {
    return 3;
}
Function Expressions
--------------------

//anonymous function expression
var a = function() {
    return 3;
}

//named function expression
var a = function bar() {
    return 3;
}

//self invoking function expression
(function sayHello() {
    alert("hello!");
})();