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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

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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Inversion of Control

Inversion of Control

Explore the principle of inversion of control in Ruby.

There are many more methods that accept blocks in Ruby, and they do very different things. However, they have one thing in common: a method that accepts a block from us can pass control to us.

This design is an example of the principle of inversion of control, and it’s the real reason why Rubyists love blocks so much.

What does that mean?

In short, it ...