[Solved] What will be the output of the following Ruby code?module MathTools def self.square(x) x * x end end puts MathTools.square(4) | Ruby

Ruby - Modules and Mixins

What will be the output of the following Ruby code?

module MathTools
  def self.square(x)
    x * x
  end
end

puts MathTools.square(4)

A16

Bsquare

CError: undefined method

D4

Step-by-Step Solution

Solution:

Step 1: Understand the method definition
The method square is defined as a module method using self.square. It returns the square of the input.
Step 2: Calculate the output
Calling MathTools.square(4) returns 4 * 4 = 16, which is printed.
Final Answer:
16 -> Option A
Quick Check:
4 squared = 16 [OK]

Quick Trick: Multiply input by itself in module method [OK]

Common Mistakes:

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