[Solved] What will this Ruby code print?def count_down(n) while n > 0 yield n n -= 1 end end count_down(3) { |i| puts i * 2 } | Ruby

Ruby - Blocks, Procs, and Lambdas

What will this Ruby code print?

def count_down(n)
  while n > 0
    yield n
    n -= 1
  end
end
count_down(3) { |i| puts i * 2 }

A3 2 1

B6 4 2

C2 4 6

DError: block missing

Step-by-Step Solution

Solution:

Step 1: Trace the loop and block calls
The method counts down from 3 to 1, yielding each number to the block.
Step 2: Calculate block output for each yield
The block multiplies each number by 2, printing 6, then 4, then 2.
Final Answer:
6 4 2 -> Option B
Quick Check:
Block multiplies each number by 2 [OK]

Quick Trick: Block runs for each yielded value [OK]

Common Mistakes:

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