What is a variable?
All computer languages are dealing with data. A variable is a box that can hold data. The data have a specific type: Number, Character, String, Date, Time, or a complex object like image or collection of numbers.
Declaring a variable
In this case the salary will have a default value: undefined
Later we need to assign a value to a variable to be useful.
Assign a value to your variable
//Declare an integer variable using type inference salary = 1000; //Alternatively, we can assign the variable a string value: salary = "entry level"; //We can also assign it a boolean value: salary=True; //We can also declare and assign a variable //on the same line in order to make our code shorter: var salary = 1000; //Later in our code, we might decide we want to change //the value of our variable. To do that, //we simply assign our variable a new value: var salary = 2000;
Declare many variables
We can declare more than one variable into a single line.
//declare 3 variables on single line var driver = "John", car = "Acura", year = "1999"; //declare 3 variables in one single statement var driver = "Xena", car = "Porche", year = "2015";