The more I study React and Vue, the more I realize that developers often spend more time debating frameworks than understanding the fundamentals that make those frameworks possible.
Discussions about performance, developer experience, ecosystem maturity, and new features are everywhere. While these conversations are valuable, they often overlook a simple reality: React and Vue are ultimately abstractions built on top of JavaScript.
When we look beneath the APIs we use every day, we find the same underlying concepts repeatedly appearing in different forms.
Take useMemo in React and computed() in Vue, for example. Although their implementations differ, both rely on the same fundamental ideas: caching, dependency tracking, and closures. The framework provides a convenient abstraction, but the underlying principles remain unchanged.
The same is true for useCallback. Many developers treat it as a magical optimization tool, when in reality it is primarily a mechanism for preserving function references across renders. To fully understand its behavior, you need to understand closures, memory references, and dependency comparisons.
