Ruby - Blocks, Procs, and Lambdas
What will be printed when this Ruby code runs?
def call_twice
yield
yield
end
call_twice { puts 'Hello' }What will be printed when this Ruby code runs?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze method
The methodcall_twicecallsyieldtwo times.Step 2: Block execution
The block prints 'Hello' each timeyieldis called.Final Answer:
Hello Hello -> Option CQuick Check:
Yield calls block twice, prints twice [OK]
Quick Trick: Yield executes block each time it's called [OK]
Common Mistakes:
- Assuming yield runs block only once
- Expecting no output without explicit return
- Thinking yield requires block_given? check always
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