Laziness is a Virtue: Lazy, Functional, Immutable Ruby

on YouTube ↗25m

" summary

Argues that computing values only when needed improves readability and changeability and shows concrete Ruby techniques: refactoring a Rails controller to defer current_account, using the memoization idiom (and its thread and nil caveats) and the memorizable/memo gems, defining immutable value objects with Ruby 3.2 data class and overrides, using ActiveRecord lazy relations and Lazy enumerators to build queries without executing them, and applying a functional-core/imperative-shell pattern to keep side effects isolated.

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" chapters (7)

1. 0:00Introduction
2. 1:05Laziness
3. 3:20Memorization
4. 10:31Functional Programming
5. 12:04Lazy
6. 15:54Better Styles
7. 17:37Lazy Manifesto

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