Q1. How does the Svelte compiler implement reactivity?
Svelte is a compiler, not a runtime framework. At build time it parses components and turns reactive statements into precise DOM update instructions. In Svelte 3 and 4, l...
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Q2. How does reactivity work in Vue 3 with Proxy?
Vue 3 wraps reactive objects in an ES Proxy that intercepts get and set operations. On a get, track() records the currently active effect (a render function, computed or ...
Q3. What is React?
React (aka React.js or ReactJS) is an **open-source front-end JavaScript library** for building user interfaces based on components. It's used for handling the view layer...
Q4. What are the major features of React?
React offers a powerful set of features that have made it one of the most popular JavaScript libraries for building user interfaces: **Core Features:** - **Component-Base...
Q5. What is JSX?
_JSX_ stands for _JavaScript XML_ and it is an XML-like syntax extension to ECMAScript. Basically it just provides the syntactic sugar for the `React.createElement(type, ...
Q6. What is the difference between an Element and a Component?
**Element:** - A React **Element** is a plain JavaScript object that describes what you want to see on the UI. It represents a DOM node or a component at a specific point...
Q7. Why does mutating arrays or objects sometimes not update a Svelte 3/4 component?
In Svelte 3 and 4 reactivity is triggered by assignment to the variable the compiler tracks. Mutating an array or object in place does not notify the compiler because no ...
Q8. What are Angular signals and how do they change reactivity?
Signals are Angular's fine-grained reactive primitive. A signal(0) holds a value; reading it with count() registers the consumer as a dependency, and writing with count.s...
Q9. What is the difference between ref and reactive, and what are the pitfalls?
ref creates a reactive reference that can hold any value, including primitives, and is accessed through .value in JavaScript while auto-unwrapping in templates. reactive ...
Q10. How to create components in React?
Components are the building blocks of creating User Interfaces(UI) in React. There are two possible ways to create a component. 1. **Function Components:** This is the si...