Question 1

How do , and compose in Vue 3?

Accepted Answer

**Target Audience:** Developers who already know [Transition](/interview-question/how-do-transition-and-transitiongroup-work), [KeepAlive](/interview-question/what-is-keep-alive-in-vue) and [Suspense](/interview-question/what-is-suspense-in-vue) on their own and need them to work together. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. The tra

Question 2

What is keep-alive in Vue?

Accepted Answer

**Target Audience:** Developers who know components and [dynamic components](/interview-question/how-do-dynamic-components-work) and want to keep state across switches. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every hook log and warning below was produced by compiling and mounting the code on Vue 3.5.44 in jsdom with the repo's ver

Question 3

How do you optimize performance in a Vue app?

Accepted Answer

**Target Audience:** Vue developers who have shipped an app and now need a method for making it faster. Assumes the Composition API basics. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every number here was measured for this answer on Vue 3.5.44: the re-render counts by mounting the runnable example in jsdom with scripts/verify-vue-exa

Question 4

What are Vue lifecycle hooks?

Accepted Answer

**Target Audience:** Vue developers who can write a component and want to know exactly when their code runs.
**Difficulty:** Medium

> **How to read this doc:** Plain language first, then `📌 Interview term:` callouts. Every ordering in this doc was printed by `console.log` calls in real components, compiled and mounted in jsdom (or rendered with `renderToString`) on Vue 3.5.44. Nothing about order is quoted from memory.

## 1. Why This Even Matters — A Story First

Think about opening a shop fo

Question 5

How do dynamic components work?

Accepted Answer

**Target Audience:** Developers who know basic Vue templates and components and want to understand runtime component switching. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every output block in this doc was produced by compiling and running the code on Vue 3.5.44, either with the repo's verify-vue-example.mjs harness (compile t

VUE.JSDECODED.

Medium

How do <Transition>, <KeepAlive> and <Suspense> compose in Vue 3?

What is keep-alive in Vue?

How do you optimize performance in a Vue app?

What are Vue lifecycle hooks?

How do dynamic components work?