Given an array items of hashes with keys :title and :rating, how do you sort items first by descending :rating and then by ascending :title using sort_by?

hard📝 Application Q8 of 15

Ruby - Enumerable and Collection Processing

Given an array items of hashes with keys :title and :rating, how do you sort items first by descending :rating and then by ascending :title using sort_by?

Aitems.sort_by { |item| [item[:title], -item[:rating]] }

Bitems.sort_by { |item| [item[:rating], item[:title]] }

Citems.sort_by { |item| [-item[:rating], item[:title]] }

Ditems.sort_by { |item| [-item[:title], item[:rating]] }

Step-by-Step Solution

Solution:

Step 1: Sort by multiple criteria
Use an array of keys in sort_by to sort by multiple fields.
Step 2: Descending rating
Negate rating to sort descending: -item[:rating].
Step 3: Ascending title
Use title as is for ascending alphabetical order.
Final Answer:
items.sort_by { |item| [-item[:rating], item[:title]] } -> Option C
Quick Check:
Negate numeric keys for descending in sort_by [OK]

Quick Trick: Negate numeric keys for descending sort in sort_by [OK]

Common Mistakes:

Not negating rating for descending order
Swapping order of keys incorrectly
Negating string keys which causes errors

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More Ruby Quizzes

Given an array items of hashes with keys :title and :rating, how do you sort items first by descending :rating and then by ascending :title using sort_by?

Step 1: Sort by multiple criteria

Step 2: Descending rating

Step 3: Ascending title

Final Answer:

Quick Check:

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