Proxy and Reflect

A deep-dive into JavaScript's Proxy and Reflect objects. Covers how Proxy lets you intercept and redefine internal object operations (like [[Get]], [[Set]], [[Delete]]) using handler traps, and how Reflect provides matching static methods that ensure your custom handlers still conform to the language specification's invariants. Practical examples progress from basic property interception to data validation, access counting, and building a lightweight reactive state system with subscriptions — all without third-party frameworks.