You want to build a Ruby DSL that allows nested configuration like this:

hard📝 Application Q15 of 15

Ruby - Advanced Metaprogramming

config = Config.new do
  database do
    adapter 'sqlite3'
    pool 5
  end
  cache do
    enabled true
    size 64
  end
end

Which approach best supports this nested DSL pattern?

AUse global variables to store settings inside blocks

BUse class variables to share state across blocks

CUse instance_eval with separate classes for database and cache blocks

DUse eval with string interpolation for nested blocks

Step-by-Step Solution

Solution:

Step 1: Understand nested DSL needs
Nested blocks require separate context objects for database and cache to hold their settings.
Step 2: Identify best practice
Using instance_eval on separate classes for each nested block cleanly isolates configuration and supports nested DSL.
Final Answer:
Use instance_eval with separate classes for database and cache blocks -> Option C
Quick Check:
Nested DSL = instance_eval + separate classes [OK]

Quick Trick: Use instance_eval with helper classes for nested blocks [OK]

Common Mistakes:

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