2. HowTo
3. Ruby Howtos

Ruby Version

• Change Ruby Version on Mac
• Update Ruby Version in macOS

Ruby File

• Read Files in Ruby
• Check if a File Exists in Ruby
• Ruby List File in Folder
• Read Lines of a Files in Ruby
• Write to a File in Ruby

Ruby Fibonacci

• Fibonacci Sequence in Ruby

Ruby YAML

• YAML in Ruby

Ruby Assertion

• Assertions in Ruby

Ruby Method

• Use the Freeze Method in Ruby
• Difference Between require and require_relative in Ruby
• Fix Undefined Method in Ruby
• Generate Random Number in Ruby
• The send Method in Ruby
• Call Method in Ruby
• Convert a String to Lowercase or Uppercase in Ruby

Ruby Operator

• Combined Comparison Operator <=> in Ruby
• The Binary Left Shift Operator in Ruby
• Ruby ? ? Means
• Difference Between OR and Double Pipe Operator in Ruby

Ruby Time

• Get Current Time in UTC in Ruby

Ruby String

• Get Substring in Ruby
• Compare Strings in Ruby
• Difference Between puts and print in Ruby
• Capitalize String in Ruby
• Trim a String Without Creating a New String in Ruby
• Convert a String to Lowercase or Uppercase in Ruby
• Ruby Write Multi-Line String
• Concatenate Strings in Ruby
• Check Whether a String Contains a Substring in Ruby
• Convert Array to String in Ruby

Ruby Array

• Convert Array to Hash in Ruby
• Remove Duplicates From a Ruby Array
• Difference Between Each_with_index and each.with_index in Ruby
• Filter an Array in Ruby
• Get Maximum and Minimum Number in a Ruby Array
• The continue Keyword in Ruby
• Remove an Array Element in Ruby
• The %W Syntax Mean in Ruby
• Sum an Array of Numbers in Ruby
• Find a Value in a Ruby Array
• Map an Array With Index in Ruby
• Check if Value Exists in Array in Ruby
• Iterate Through a Ruby Array
• Convert Array to String in Ruby

Ruby Script

• Run Ruby Script in Terminal

Ruby Variable

• Ruby Class Variables
• Attr Accessor in Ruby

Ruby Class

• Difference Between Class and Class Instance Variables in Ruby
• Understanding Class << Self in Ruby

Ruby Shell

• Execute Shell Commands in Ruby

Ruby Exception

• Handle Exceptions Using Begin and Rescue in Ruby
• try...catch in Ruby

Ruby Safe Navigation

• Use Safe Navigation in Ruby

Ruby Inject

• Use the inject Method in Ruby

Ruby Gem

• Install a Specific Verson for a Gem in Ruby

Ruby XML

• Parsing XML With Ruby

Ruby Accessor

• The Attr_accessor, Attr_reader, and Attr_writer in Ruby

Ruby Inheritance

• The Kind_of, Instance_of, and Is_a In Ruby

Ruby Hash

• Add an Item to a Ruby Hash

Ruby Enum

• Enum in Ruby

Ruby Gems

• Update Ruby Gems

Ruby Pattern Matching

• Use Pattern Matching Operator in Ruby

Ruby Attr Accessor

• Attr Accessor in Ruby

Ruby Keyword

• The do Keyword in Ruby

Ruby Object

• Determine Object Type in Ruby

Ruby Methods

• Determine Object Type in Ruby
• Require vs Include in Ruby

Ruby Condition

• Write One Line if Statement in Ruby

Ruby Operators

• Write One Line if Statement in Ruby

Ruby Boolean

• Conditional Assignment in Ruby
• Ruby && vs And

Ruby JSON

• Parse a JSON String in Ruby

Ruby Map

• The map Method in Ruby
• Map an Array With Index in Ruby

Ruby Switch Statement

• Write a Switch Statement in Ruby

Ruby Input

• Accept User Input With Gets in Ruby

Ruby CLI

• Accept User Input With Gets in Ruby

Ruby Loop

• For vs Each in Ruby

Ruby Comment

• Ruby Multi-Line Comment