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Ruby OOP (Object-Oriented Programming)

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Objects

Objects, Classes, and Methods Objects Are Instances of Classes Objects Have Methods Calling Methods Passing Arguments Listing and Chaining Methods Predicate Methods Bangs Quiz on Objects Exercise 1: Chaining

Blocks

What Are Blocks Alternative Block Syntaxes Block Arguments Block Return Values Exercise 1: Extract Even Elements from an Array Inversion of Control Iterators Quiz on Blocks Exercise 2: Even Reversed Exercise 3: Sum the Rows of a Matrix Exercise 4: Print the Output Using Nested Arrays

Conditionals

What Are Conditionals?Shorthand Syntax Conditionals Return Values Nothingness and the Truth Quiz on Conditionals Exercise 1: Number of Days in a Month

Writing Classes

Getting Started with Classes

Defining and Instantiating Classes

Defining Instance Methods

Initializing Objects

Instance Variables

Class Variables

Attribute Readers

Attribute Writers

State and Behavior

Interacting Objects

Object Scope and Self

Quiz on Classes

Exercise 1: Make a Rectangle Class

Exercise 2: On Class Methods

Project

Mini project 1

Conclusion

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State and Behavior

State and Behavior

Learn why encapsulation is an important idea.

Data and methods

Let’s have another look at our class definition for Person:

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class Person
  def initialize(name)
    @name = name
  end
  def name
    @name
  end
  def password=(password)
    @password = password
  end
end

Our class demonstrates an important thing about objects: There’s a way to ask a person for their name, but no way to set a new name. On the other hand, there’s a way to set a new password, but no way to ask for it. ...