Which of the following is the correct syntax to add a method hello to class Person using class_eval?

easy📝 Syntax Q3 of 15

Ruby - Advanced Metaprogramming

Which of the following is the correct syntax to add a method hello to class Person using class_eval?

APerson.class_eval do; def hello; 'Hi'; end; end

BPerson.class_eval { def hello; 'Hi'; end }

CPerson.instance_eval { def hello; 'Hi'; end }

DPerson.instance_eval do; def hello; 'Hi'; end; end

Step-by-Step Solution

Solution:

Step 1: Identify class_eval syntax
class_eval can be called with a block using curly braces or do-end without semicolons.
Step 2: Check syntax correctness
Person.class_eval { def hello; 'Hi'; end } uses correct syntax with curly braces and defines method inside the block properly.
Final Answer:
Person.class_eval { def hello; 'Hi'; end } -> Option B
Quick Check:
Correct class_eval syntax = Person.class_eval { def hello; 'Hi'; end } [OK]

Quick Trick: Use class_eval with braces or do-end without semicolons [OK]

Common Mistakes:

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