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AI tried to double a list with .each. The result is unchanged, because each returns the ORIGINAL array, not the results. map returns a new, transformed list. each is to DO something; map is to MAKE something. Lesson 21, Module 3. nums = [1, 2, 3] doubled = nums.each { |n| n * 2 } # → [1, 2, 3] (unchanged!) doubled = nums.map { |n| n * 2 ...
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