codequest.
No account needed
Color theme

YOUR RUBY LEARNING PATH

A little more Ruby.
A little more confidence.

One idea at a time, with examples you can follow and checkpoints to see what’s clicking. New here? Begin with chapter one. Know a little already? Jump right in.

Before you start

Start with the values chapter. Basic programming experience is helpful for the later blocks, methods, and collection transformations; review the linked foundations whenever needed.

Review a foundation whenever you need it: First Python program · Decisions and loops · Small functions

Start chapter one Ready for the final?
13 open chapters. Your progress is saved as you go.

Your chapters

Choose any starting point
  1. 01

    Values and expressions

    Beginner

    Read Ruby’s truth rules and value-producing branches.

    Start here, or skip ahead
    Open chapter: Values and expressions
  2. 02

    String mutation and precise matching

    Intermediate

    Separate normalized copies from changes to shared text.

    Open whenever you’re ready
    Open chapter: String mutation and precise matching
  3. 03

    Methods, arguments, and blocks

    Beginner

    Write reusable operations with clear return and calling rules.

    Open whenever you’re ready
    Open chapter: Methods, arguments, and blocks
  4. 04

    Keyword arguments and explicit options

    Intermediate

    Make call-site intent readable without losing argument contracts.

    Open whenever you’re ready
    Open chapter: Keyword arguments and explicit options
  5. 05

    Array copies and nested state

    Intermediate

    Make the depth of independence part of the collection contract.

    Open whenever you’re ready
    Open chapter: Array copies and nested state
  6. 06

    Enumerable transformations

    Intermediate

    Choose collection operations from the desired result shape.

    Open whenever you’re ready
    Open chapter: Enumerable transformations
  7. 07

    Hash defaults and mutation

    Intermediate

    Make shared state and missing-key behavior explicit.

    Open whenever you’re ready
    Open chapter: Hash defaults and mutation
  8. 08

    Sorting and deterministic tie rules

    Intermediate

    Order results without mutating inputs or leaving ties unexplained.

    Open whenever you’re ready
    Open chapter: Sorting and deterministic tie rules
  9. 09

    Objects with small behavior contracts

    Advanced

    Compose behavior through methods and modules.

    Open whenever you’re ready
    Open chapter: Objects with small behavior contracts
  10. 10

    Inheritance, super, and substitution

    Advanced

    Extend behavior while respecting the parent’s promises.

    Open whenever you’re ready
    Open chapter: Inheritance, super, and substitution
  11. 11

    Recursive decomposition and termination

    Advanced

    Trace both calls and returns while proving progress.

    Open whenever you’re ready
    Open chapter: Recursive decomposition and termination
  12. 12

    Lazy sequences and controlled failure

    Advanced

    Keep large traversals bounded and cleanup predictable.

    Open whenever you’re ready
    Open chapter: Lazy sequences and controlled failure
  13. 13

    Contract-focused tests and boundaries

    Advanced

    Use examples that expose wrong algorithms rather than merely exercise code.

    Open whenever you’re ready
    Open chapter: Contract-focused tests and boundaries

PUT IT TOGETHER

Final assessment & certificate

30 multiple-choice questions and 2 written coding problems. Pass the knowledge section at 80% overall and at least 50% in every chapter area, complete and review the written practice, and meet the attempt-integrity checks to unlock your certificate.

The certificate records a CodeQuest foundations assessment. Written work is self-reviewed; identity and independent proficiency are not verified.

Open final assessment

Take an issuer-recorded assessment with a verifiable certificate

Continue the original guided missions