Ruby - Control Flow
Given this Ruby code, what will be the output?
values = [0, 1, nil, 5]
results = values.map { |v| v ? "Yes" : "No" }
puts results.inspectGiven this Ruby code, what will be the output?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand truthiness in Ruby
In Ruby, 0 and 1 are truthy, nil is falsy.Step 2: Apply ternary operator to each element
For each value: 0 (truthy) -> "Yes", 1 (truthy) -> "Yes", nil (falsy) -> "No", 5 (truthy) -> "Yes".Step 3: Check mapped results
The results array is ["Yes", "Yes", "No", "Yes"].Final Answer:
["Yes", "Yes", "No", "Yes"] -> Option CQuick Check:
Truthy values = "Yes", nil = "No" [OK]
Quick Trick: Remember: only nil and false are falsey in Ruby [OK]
Common Mistakes:
MISTAKES- Thinking 0 is falsy
- Confusing nil with false
- Misreading map block
Master "Control Flow" in Ruby
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