How can you transform an array of strings to uppercase using iterators in Ruby?

hard📝 Application Q9 of 15

Ruby - Loops and Iteration

Aarr.each { |s| s.upcase }

Barr.collect_each { |s| s.upcase }

Carr.for_each { |s| s.upcase }

Darr.map { |s| s.upcase }

Step-by-Step Solution

Solution:

Step 1: Identify method to transform and return new array
map returns a new array with transformed elements.
Step 2: Check method names and behavior
each returns original array; for_each and collect_each do not exist.
Final Answer:
arr.map { |s| s.upcase } -> Option D
Quick Check:
Transform array with map = B [OK]

Quick Trick: Use map to transform and return a new array [OK]

Common Mistakes:

MISTAKES

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