RFS: Class and Instance Methods - 003

Understanding how the documentation is laid out can be helpful when learning ruby. This means we have to understand the difference between Class methods and instance methods.

• Ruby Integer

Class Methods

Class methods are methods that need to be called in the context of a class for example

Integer.sqrt(9)=> 3

We are calling the .sqrt method from the Integer class this is known as a class method.

Instance Methods

Instance methods are methods that need to be called on the instance for example 2 is an instance of the class Integer

2.odd?=> false2.even?=> true

In this case .odd? and .even? are instance methods, they need to be called from the instance itself.