Variables
Description
Variables are containers for storing data values. They can be used in expressions.
The
var statement declares a
variable, optionally initializing it to a value.
Variable names can contain letters, digits and underscores. Digits cannot be the first character in the name of a
variable. The same rules apply to
functions.
The current data types are:
number,
string,
boolean,
array,
object
The undefined and null data types are special in that they can have only one value.
Undefined variables have been declared but have not been assigned a value.
A variable can be explicitly emptied of its current contents by assigning it the null value.
Default Value:
undefined
Example Code
var x = 5
var y = 6
var z = x + y
var string = 'example'
var example
/*
From the example above, you can expect:
x stores the value 5 as a number data type
y stores the value 6 as a number data type
z stores the value 11 as a number data type
string stores the value example as a string data type
example stores the value undefined as an undefined data type
*/