Ruby - Enumerable and Collection Processing
Which Ruby code snippet correctly uses
reject to remove all odd numbers from an array numbers?Which Ruby code snippet correctly uses reject to remove all odd numbers from an array numbers?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the condition to reject
We want to remove odd numbers, so the block should return true for odd numbers.Step 2: Analyze each option
numbers.reject { |n| n.odd? } rejects elements wheren.odd?is true, correctly removing odd numbers.
numbers.reject { |n| n.even? } rejects even numbers, which is incorrect.
numbers.reject(&:even?) usesreject(&:even?), which removes even numbers.
numbers.reject { |n| n % 2 == 0 } rejects numbers divisible by 2 (even numbers), also incorrect.Final Answer:
numbers.reject { |n| n.odd? } -> Option DQuick Check:
Reject odd numbers by checking n.odd? [OK]
Quick Trick: Reject elements where condition is true [OK]
Common Mistakes:
- Mixing up odd? and even? methods
- Using reject with wrong condition
- Assuming reject modifies original array
Master "Enumerable and Collection Processing" in Ruby
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Ruby Quizzes