Study Guide for Interview

RB109

General Topics

• Mutable and Immutable Objects
• Logical Operators
• Ruby’s Comparable
• Ruby’s gets and chomp
• Ruby’s ::new Class

String

• Substrings in Ruby
• Ruby’s casecmp? Method
• Ruby’s gsub Method
• Ruby’s format Method
• Ruby’s delete and count Method
• Ruby’s center Method
• Practice Problems: Substrings Manipulation

Collections: Array and Hash

• Mutation in Arrays
• The inject and reduce Method
• Ruby’s any? Method
• Difference Between sort and sort_by in Ruby
• Practice Problems: Arrays Manipulation
• Practice Problems: Arrays Manipulation
• Practice Problems: Indexes Manipulation

Loop

• while, until and for Loop

Other

• Ruby’s case Statement One Liner
• Ruby’s Ternary Operator
• Practice Problems: Arrays Manipulation
• Maths Shortcut Tricks for Code

RB129

Specific Topics of Interest

• What is Object Oriented Programming
• Polymorphism
  • Duck Typing
• Classes and Objects
  • Attributes vs State
• Collaborator Objects
• Variable Scope in Object Oriented Programming
• Method Lookup Path
• Modules