Which of the following is the correct syntax to filter even numbers from an array nums using select?

easy📝 Syntax Q12 of 15

Ruby - Enumerable and Collection Processing

Which of the following is the correct syntax to filter even numbers from an array nums using select?

Anums.select(n) { n % 2 == 0 }

Bnums.select do n n % 2 == 0 end

Cnums.select { n => n % 2 == 0 }

Dnums.select { |n| n % 2 == 0 }

Step-by-Step Solution

Solution:

Step 1: Review Ruby block syntax for select
The select method requires a block with a parameter and a condition, usually written as { |param| condition }.
Step 2: Identify correct syntax
nums.select { |n| n % 2 == 0 } uses correct block syntax with |n| and condition n % 2 == 0. Other options have syntax errors or wrong block usage.
Final Answer:
nums.select { |n| n % 2 == 0 } -> Option D
Quick Check:
Correct block syntax = nums.select { |n| n % 2 == 0 } [OK]

Quick Trick: Use curly braces with |variable| for select blocks [OK]

Common Mistakes:

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