[Solved] Identify the error in this Ruby DSL method definition:def setup(&block) instance_eval(block) end — Ans: Passing block without calling it causes error; should use instance_eval(&block) | Ruby

Ruby - Advanced Metaprogramming

Identify the error in this Ruby DSL method definition:

def setup(&block)
  instance_eval(block)
end

AMethod should use yield instead of instance_eval

BBlock parameter should be omitted for instance_eval

Cinstance_eval cannot be used with blocks

DPassing block without calling it causes error; should use instance_eval(&block)

Step-by-Step Solution

Solution:

Step 1: Understand instance_eval usage
instance_eval expects a block passed with &block syntax, not a block object as argument.
Step 2: Identify the error
Passing block as instance_eval(block) passes a Proc object as argument, which is incorrect.
Final Answer:
The correct usage is instance_eval(&block) -> Option D
Quick Check:
Block must be passed with & to instance_eval [OK]

Quick Trick: Use &block to pass block to instance_eval [OK]

Common Mistakes:

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