[Solved] What will this code output?enum = (1..10).lazy.map { |x| x * 2 }.select { |x| x > 10 }.forcep enum — Ans: [12, 14, 16, 18, 20] | Ruby

Ruby - Functional Patterns in Ruby

What will this code output?

enum = (1..10).lazy.map { |x| x * 2 }.select { |x| x > 10 }.force
p enum

A[2, 4, 6, 8, 10]

B[11, 12, 13, 14, 15]

C[12, 14, 16, 18, 20]

DError: No method 'force' for Enumerator

Step-by-Step Solution

Solution:

Step 1: Trace lazy map and select
Map doubles numbers 1 to 10: [2,4,6,8,10,12,14,16,18,20]. Select keeps those > 10: [12,14,16,18,20].
Step 2: Understand .force usage
.force converts lazy enumerator to an array, so enum is the filtered array.
Final Answer:
[12, 14, 16, 18, 20] -> Option C
Quick Check:
Lazy map and select then force = [12, 14, 16, 18, 20] [OK]

Quick Trick: Use .force to realize lazy enumerator into array [OK]

Common Mistakes:

Master "Functional Patterns in Ruby" in Ruby

9 interactive learning modes - each teaches the same concept differently

More Ruby Quizzes

What will this code output?