Which of the following correctly sorts an array employees of hashes by the :salary key using sort_by?

easy📝 Syntax Q3 of 15

Ruby - Enumerable and Collection Processing

Which of the following correctly sorts an array employees of hashes by the :salary key using sort_by?

Aemployees.sort_by { |e| e[:salary].to_s }

Bemployees.sort_by(&:salary)

Cemployees.sort_by { |e| e.salary }

Demployees.sort_by { |e| e[:salary] }

Step-by-Step Solution

Solution:

Step 1: Access hash values correctly
Hashes use symbol keys accessed with e[:salary].
Step 2: Use sort_by with a block
The block should return the value to sort by.
Step 3: Evaluate options
employees.sort_by { |e| e[:salary] } correctly uses e[:salary]. employees.sort_by(&:salary) uses method syntax invalid for hashes. employees.sort_by { |e| e.salary } uses dot notation invalid for hashes. employees.sort_by { |e| e[:salary].to_s } converts salary to string, which changes sorting behavior.
Final Answer:
employees.sort_by { |e| e[:salary] } -> Option D
Quick Check:
Hash keys accessed with [:key] in sort_by [OK]

Quick Trick: Use symbol keys with [:key] inside sort_by block [OK]

Common Mistakes:

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