[Solved] Which syntax correctly reopens the Integer class to add a method double? — Ans: class Integer def double self * 2 end end | Ruby

Ruby - Class Methods and Variables

Which syntax correctly reopens the Integer class to add a method double?

Aclass Integer.new def double self * 2 end end

Bdef Integer.double self * 2 end

Cclass Integer() def double self * 2 end end

Dclass Integer def double self * 2 end end

Step-by-Step Solution

Solution:

Step 1: Recognize correct class reopening syntax
Reopening a class uses class ClassName followed by method definitions.
Step 2: Analyze each option
class Integer def double self * 2 end end correctly reopens Integer and defines double. def Integer.double self * 2 end tries to define a singleton method incorrectly. The options using class Integer.new and class Integer() have invalid syntax.
Final Answer:
class Integer def double self * 2 end end -> Option D
Quick Check:
Reopen class with class ClassName [OK]

Quick Trick: Use 'class ClassName' to reopen and add methods [OK]

Common Mistakes:

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Which syntax correctly reopens the Integer class to add a method double?