Bird
0
0

What happens if you use select on an array with duplicate elements that meet the condition?

hard📝 Conceptual Q10 of 15
Ruby - Enumerable and Collection Processing
What happens if you use select on an array with duplicate elements that meet the condition?
Aselect raises an error on duplicates
BOnly unique elements are included, duplicates removed
CAll matching duplicates are included in the result
DOnly the first matching duplicate is included
Step-by-Step Solution
Solution:

  1. Step 1: Understand select behavior with duplicates

    select filters elements but does not remove duplicates.

  2. Step 2: Confirm inclusion of all matching elements

    All elements that satisfy the condition, including duplicates, are included in the returned array.

  3. Final Answer:

    All matching duplicates are included in the result -> Option C

  4. Quick Check:

    select keeps duplicates if they match condition [OK]
Quick Trick: select does not remove duplicates, just filters [OK]
Common Mistakes:
  • Assuming select removes duplicates
  • Expecting errors on duplicates
  • Thinking only first match is kept

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Ruby Quizzes
Blocks, Procs, and Lambdas - Yield to execute blocks - Quiz 13medium Class Methods and Variables - Open classes (reopening classes) - Quiz 13medium Class Methods and Variables - Object#dup and Object#clone - Quiz 4medium Class Methods and Variables - Frozen objects - Quiz 6medium Classes and Objects - To_s method for string representation - Quiz 14medium Classes and Objects - Why everything is an object in Ruby - Quiz 6medium Enumerable and Collection Processing - Any?, all?, none? predicates - Quiz 11easy Error Handling - Raise for throwing errors - Quiz 15hard File IO - File.read for entire content - Quiz 3easy Modules and Mixins - Module declaration syntax - Quiz 13medium