Getting Absolute Value with abs

Ruby Comments

Symbols vs Strings

Numeric Arithmetic

Variables and Dynamic Typing

Basic Data Types

String Interpolation

Variable Scope Prefixes

What Ruby Is

Ruby's Design Philosophy

Type Conversion Methods

The Meaning of nil

Method Call Syntax

String Literals

Getting User Input

Truthiness Rules

Running Ruby Code

Naming Conventions

Everything Is an Object

Printing Output

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

AND vs OR in a Range Check

Commenting Code Correctly

Comparison vs Assignment

Symbol vs String Hash Key

Reading Input with gets

Assigning a Variable

Concatenating a String and Number

The elsif Keyword

Converting a Decimal String

Integer vs Float Division

Defining a Constant

Truthiness of Zero

Printing Output with puts

Comments in Ruby

Your First Ruby Output: puts, print, p

Running Ruby: Files vs IRB

Symbols vs Strings

Core Built-in Data Types

The nil Value

Comments in Ruby

Reading User Input

Variable Naming and Scope Prefixes

Arithmetic and Operators

What Ruby Is and Its Origins

Ruby Conventions and Style

Variables and Assignment

Dynamically and Strongly Typed

Printing Output

Running Ruby Code

String Basics

Ruby Is Interpreted

Everything Is an Expression

Truthiness in Ruby

Ruby's Design Philosophy

Everything Is an Object

Installing Ruby and Checking the Version

Ruby: Interpreted & Dynamically Typed

What Ruby Is: History & Philosophy