[Solved] Given this Ruby code, what will be the output?data = [3, 7, 12, 18] case data in [Integer, Integer, Integer, Integer] puts "All integers" in [Integer, Integer, Integer, 18] puts "Last is 18" else... | Ruby

Ruby - Control Flow

Given this Ruby code, what will be the output?

data = [3, 7, 12, 18]
case data
in [Integer, Integer, Integer, Integer]
  puts "All integers"
in [Integer, Integer, Integer, 18]
  puts "Last is 18"
else
  puts "No match"
end

ANo match

BLast is 18

CAll integers

DSyntaxError

Step-by-Step Solution

Solution:

Step 1: Understand array pattern matching order
The case checks patterns in order. The first pattern matches any array of four integers.
Step 2: Check if data matches first pattern
Data is [3,7,12,18], all integers, so it matches the first pattern.
Step 3: Confirm second pattern is not reached
Since first pattern matches, second is skipped.
Final Answer:
All integers -> Option C
Quick Check:
First matching pattern runs, so output is "All integers" [OK]

Quick Trick: Patterns checked top-down; first match wins [OK]

Common Mistakes:

Assuming second pattern runs despite first matching
Confusing element types with values in patterns
Expecting syntax error due to pattern complexity

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