Creating a number is easy, it can be done just like for any other variable type using the var keyword.

Numbers can be created from a constant value:

// This is a float:
var a = 1.2;

// This is an integer:
var b = 10;

Or from the value of another variable:

var a = 2;
var b = a;

JavaScript has only one type of numbers – 64-bit float point. It's the same as Java's double. Unlike most other programming languages, there is no separate integer type, so 1 and 1.0 are the same value.

In this chapter, we'll learn how to create numbers and perform operations on them (like additions and subtractions).

Some advanced operators can be used, such as:

• Modulus (division remainder): x = y % 2

• Increment: Given a = 5

  • c = a++, Results: c = 5 and a = 6

  • c = ++a, Results: c = 6 and a = 6

• Decrement: Given a = 5

  • c = a--, Results: c = 5 and a = 4

  • c = --a, Results: c = 4 and a = 4

You can apply mathematic operations to numbers using some basic operators like:

• Addition: c = a + b

• Subtraction: c = a - b

• Multiplication: c = a * b

• Division: c = a / b

You can use parentheses just like in math to separate and group expressions: c = (a / b) + d