Q1. 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 ...
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Q2. What is the difference between the Options API and the Composition API in Vue 3?
The Options API organises component logic into fixed options such as data, methods, computed, watch and lifecycle hooks. The Composition API organises the same logic insi...
Q3. Compare the OSI model and the TCP/IP model.
The OSI model is a seven-layer reference model: Physical, Data Link, Network, Transport, Session, Presentation and Application. The TCP/IP model as taught is four layers:...
Q4. Explain the difference between computed, watch and watchEffect.
computed derives a cached value from reactive dependencies. The getter re-evaluates only when a dependency changes and something reads the value, which makes it ideal for...
Q5. When should you prefer composition over inheritance?
Inheritance is an is-a relationship: `Dog extends Animal` because every dog is an animal. Composition is a has-a relationship: `Car` holds an `Engine`. Inheritance gives ...
Q6. 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 ...
Q7. What is the difference between relative, absolute, fixed and sticky positioning?
- static: default, follows normal flow. - relative: stays in flow but offsets from its normal position; also establishes a containing block for absolutely positioned desc...
Q8. How do slots and component composition work in Svelte?
Slots let a parent pass markup into a child. A default slot is placed with slot in the child and any children of the parent's component tag fill it. Named slots use slot ...
Q9. How do variables, $?, $@ and $* behave?
Shell variables hold strings and have no strict typing. `$?` is the exit status of the last command, where 0 means success. ```bash greeting="hello" echo "${greeting} wor...
Q10. How do you decide where to draw service boundaries?
Boundaries should follow the business domain, not technical layers. Techniques: - Domain-Driven Design bounded contexts: each context has its own model and ubiquitous lan...