Ch2: Declare, Assign a Value

Variables are used to store values (name = “John”) or expressions (sum = x + y).

Declare Variablesvar add = one + two;var minus = one - two;var multiply = one * two;ou have to use the keyword var to declare a variable like this:

var name;

Assign a Value to the Variable

You can assign a value to the variable either while declaring the variable or after declaring the variable.

var name = "John";

OR

var name;

name = "John";

Naming Variables

Though you can name the variables as you like, it is a good programming practice to give descriptive and meaningful names to the variables. Moreover, variable names should start with a letter and they are case sensitive. Hence the variables student name and studentName are different because the letter n in a name is different (n and N).

The code below on the left will print out the output on the right