マスターRuby列挙可能ファイル:each、map、select
Ruby’s Ruby Enumerable module is the powerhouse behind expressive, functional-style iteration. Mixed into Array, Hash, Range, Set, and custom collections, it enables clean, efficient data processing. Enhance your Ruby projects with expert Rails consulting services, optimizing each, map, and select for cleaner, high-performance code. Ruby Enumerable: The Foundation To use Ruby Enumerable, a class must define each: ruby class ShoppingList include Enumerable def initialize(*items) @items = items end def each(&block) @items.each(&block) end end Now ShoppingList supports all Ruby Enumerable methods. Ruby Enumerable: each – Execute Per Item What each Does Runs a block for every element. Returns the original collection. ruby [1, 2, 3].each { |n| puts n * …

