Given the array arr = [3, 1, 4, 1, 5], which code snippet correctly sorts the array in descending order using the spaceship operator?

hard📝 Application Q15 of 15

Ruby - Operators and Expressions

Given the array arr = [3, 1, 4, 1, 5], which code snippet correctly sorts the array in descending order using the spaceship operator?

Aarr.sort { |a, b| b <=> a }

Barr.sort { |a, b| a == b }

Carr.sort_by { |x| x <=> 0 }

Darr.sort { |a, b| a <=> b }

Step-by-Step Solution

Solution:

Step 1: Understand sorting with spaceship operator
The block compares two elements a and b. To sort descending, compare b to a.
Step 2: Analyze each option
arr.sort { |a, b| a <=> b } sorts ascending (a <=> b).
arr.sort { |a, b| b <=> a } sorts descending (b <=> a).
arr.sort_by { |x| x <=> 0 } misuses sort_by with spaceship operator.
arr.sort { |a, b| a == b } returns boolean, invalid for sorting.
Final Answer:
arr.sort { |a, b| b <=> a } -> Option A
Quick Check:
Reverse order uses b <=> a [OK]

Quick Trick: Reverse order: swap a and b in <=> [OK]

Common Mistakes:

MISTAKES

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