Ruby - Blocks, Procs, and Lambdas
What will this Ruby code print?
sum = 0
[1, 2, 3].each { |x| sum += x }
puts sumWhat will this Ruby code print?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand
Theeachwith blockeachmethod iterates over each element, running the block for side effects but returns the original array.Step 2: Calculate the sum
The block adds each element tosum, so sum becomes 1 + 2 + 3 = 6.Final Answer:
6 -> Option BQuick Check:
each with side effect updates sum = A [OK]
Quick Trick: each is for side effects, map returns new array [OK]
Common Mistakes:
- Expecting each to return sum
- Confusing sum with string concatenation
- Thinking sum remains zero
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