Ruby - Functional Patterns in Ruby
Identify the error in this code:
lazy_enum = (1..5).lazy.select { |x| x.even? }.map { |x| x * 3 }
puts lazy_enum[2]Identify the error in this code:
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand lazy enumerator capabilities
Lazy enumerators do not support direct indexing with[].Step 2: Check other options
Block syntax is correct; ranges can be lazy; .force is not needed but .to_a or .force can be used to convert before indexing.Final Answer:
Lazy enumerators do not support [] indexing -> Option AQuick Check:
Lazy enumerators lack [] method [OK]
Quick Trick: Use .to_a or .force before indexing lazy enumerators [OK]
Common Mistakes:
- Trying to index lazy enumerators directly
- Assuming lazy enumerators are arrays
- Confusing lazy with immediate enumerators
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