Ruby - Enumerable and Collection Processing
Which of the following is the correct syntax to filter odd numbers from an array
arr using select?Which of the following is the correct syntax to filter odd numbers from an array arr using select?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand block syntax for select
Theselectmethod requires a block with a block variable to test each element.Step 2: Identify correct block usage
arr.select { |x| x % 2 == 1 } correctly uses{ |x| x % 2 == 1 }to filter odd numbers. Other options have syntax errors or missing block variables.Final Answer:
arr.select { |x| x % 2 == 1 } -> Option BQuick Check:
Correct block syntax = arr.select { |x| x % 2 == 1 } [OK]
Quick Trick: Always use |variable| inside select block [OK]
Common Mistakes:
- Omitting block variable |x|
- Using parentheses incorrectly
- Trying to pass block as argument
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