Which of these is a valid way to use sort_by to sort an array of numbers nums by their absolute value?

easy📝 Conceptual Q2 of 15

Ruby - Enumerable and Collection Processing

Which of these is a valid way to use sort_by to sort an array of numbers nums by their absolute value?

Anums.sort_by { |n| n.absolute }

Bnums.sort_by { |n| n.abs }

Cnums.sort_by { |n| abs(n) }

Dnums.sort_by.abs { |n| n }

Step-by-Step Solution

Solution:

Step 1: Recall Ruby syntax for sort_by with block
The block should take each element and return the value to sort by, here n.abs.
Step 2: Check method usage correctness
abs is a method on numbers, so n.abs is correct. Other options misuse syntax or method names.
Final Answer:
nums.sort_by { |n| n.abs } -> Option B
Quick Check:
Correct block syntax = nums.sort_by { |n| n.abs } [OK]

Quick Trick: Use element.method inside block for sorting [OK]

Common Mistakes:

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