Getting Absolute Value with abs

What Ruby Is

Type Conversion Methods

Method Call Syntax

Naming Conventions

Truthiness Rules

The Meaning of nil

Symbols vs Strings

Numeric Arithmetic

String Interpolation

String Literals

Basic Data Types

Variables and Dynamic Typing

Everything Is an Object

Ruby Comments

Printing Output

Running Ruby Code

Ruby's Design Philosophy

Getting User Input

Variable Scope Prefixes

Ruby Expressions & Implicit Return

Getting User Input with gets

Basic Arithmetic and Operators in Ruby

Ruby String Basics and Interpolation

Ruby Naming Conventions & Case Sensitivity

Everything Is an Object in Ruby

Basic Data Types in Ruby

Variables and Assignment in Ruby

Symbol vs String Hash Key

Reading Input with gets

Printing Output with puts

Commenting Code Correctly

Assigning a Variable

Integer vs Float Division

Concatenating a String and Number

Truthiness of Zero

Comparison vs Assignment

AND vs OR in a Range Check

The elsif Keyword

Converting a Decimal String

Defining a Constant

Comments in Ruby

Your First Ruby Output: puts, print, p

Running Ruby: Files vs IRB

Dynamically and Strongly Typed

Ruby's Design Philosophy

Ruby Is Interpreted

Reading User Input

Symbols vs Strings

Printing Output

Everything Is an Object

What Ruby Is and Its Origins

Ruby Conventions and Style

Everything Is an Expression

String Basics

Core Built-in Data Types

Comments in Ruby

Variables and Assignment

Variable Naming and Scope Prefixes

The nil Value

Truthiness in Ruby

Arithmetic and Operators

Running Ruby Code

Installing Ruby and Checking the Version

Ruby: Interpreted & Dynamically Typed

What Ruby Is: History & Philosophy