Given arr = ["a", "b", "c"], which code will reverse the array and then convert each element to uppercase, modifying arr in place?

hard📝 Application Q9 of 15

Ruby - Methods

Given arr = ["a", "b", "c"], which code will reverse the array and then convert each element to uppercase, modifying arr in place?

Aarr.reverse.map(&:upcase)

Barr.reverse!.map!(&:upcase)

Carr.reverse.map(&:upcase!)

Darr.reverse!.map(&:upcase)

Step-by-Step Solution

Solution:

Step 1: Reverse array in place
reverse! reverses arr itself.
Step 2: Convert each element to uppercase in place
map! modifies arr elements in place by replacing them with new uppercase strings returned by &:upcase.
Step 3: Check method chaining correctness
arr.reverse!.map!(&:upcase) correctly reverses and uppercases arr in place.
Final Answer:
arr.reverse!.map!(&:upcase) -> Option B
Quick Check:
Use reverse! and map! to modify array in place [OK]

Quick Trick: Use bang methods to modify arrays and elements in place [OK]

Common Mistakes:

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