All variables are declared with the 'var' keyword
Variables do not have an explicit data type. There are 3 primitive data types.
Variables do not have a data type until a value is assigned to it and at that point the correct data type is inferred.
The semi-colon is optional when statements are followed by a line break.

var myNumber1 = 10;        // number data type 
var myNumber2 = 5.38; // number data type
var myString = "text"; // string data type
var myBoolean = false; // boolean data type

var varData = data;
var varName = "Smith";
var varAge = 26;
var isOdd = false;

All On One Line

The semi-colon is required when you have two or more statements on the same line.
This line creates 3 variables and assigns them values

var myObject = new Object(), myString = 'sometext', myNumber = math.random();  

Global scope

If the var keyword is omitted and a value is just assigned to a variable then it will have 'global scope'.
For global scope just leave off the var

varData = "smith"; 

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