Lazy enumeration in Ruby can be a complex concept to grasp, but it offers many benefits, especially when dealing with large datasets or expensive operations. By using Enumerator::Lazy, you can create pipelines of data transformations efficiently. Instead of processing all elements eagerly like with the default enumeration, lazy enumeration allows for a more efficient “horizontal” flow of operations, reducing unnecessary work. Ruby redefines Enumerable methods in Enumerator::Lazy, which return lazy enumerators instead of intermediate arrays. Understanding lazy enumeration can help optimize your code when dealing with extensive data sets. Explore the article’s visual analogy to better comprehend the concept.
https://joyofrails.com/articles/simple-trick-to-understand-ruby-lazy-enumerator