Composables for reusable logic in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a composable in Vue 3?

A composable is a function that uses Vue's Composition API to encapsulate and reuse reactive logic across components.

beginner

How do composables help in Vue development?

Composables help by organizing code into reusable pieces, making components cleaner and logic easier to share and test.

intermediate

Which Vue Composition API functions are commonly used inside composables?

Functions like ref, reactive, computed, and watch are commonly used to create reactive state and side effects inside composables.

beginner

How do you use a composable inside a Vue component?

You import the composable function and call it inside the <code>setup()</code> function of your component to access its reactive state and methods.

intermediate

Why should composables avoid using component-specific code like template refs or DOM manipulation?

Because composables are meant to be reusable logic units, they should stay independent of component-specific details to keep them flexible and testable.

What is the main purpose of a composable in Vue?

A To reuse reactive logic across components

B To style components with CSS

C To define HTML templates

D To manage Vuex state

Composables are functions that encapsulate reactive logic for reuse, not for styling or templates.

Where do you call a composable function inside a Vue component?

A Inside the <code>template</code> section

B Inside the <code>methods</code> option

C Inside the <code>data()</code> option

D Inside the <code>setup()</code> function

Composable functions are called inside the setup() function to access reactive state.

Which of these is NOT typically part of a composable?

A Reactive state with <code>ref</code>

B Computed properties

C Direct DOM manipulation

D Watchers for side effects

Composables should avoid direct DOM manipulation to stay reusable and independent.

What Vue API is essential for creating reactive variables in composables?

A <code>template</code>

B <code>ref</code>

C <code>emit</code>

D <code>props</code>

ref creates reactive variables used inside composables.

Why is it good to use composables in Vue projects?

A They make code reusable and easier to maintain

B They automatically generate CSS styles

C They replace the need for components

D They handle routing between pages

Composables help organize and reuse logic, improving maintainability.

Explain what a composable is in Vue and how it helps with code reuse.

Think about how you can share logic between components without repeating code.

Describe best practices when writing composables to keep them reusable and clean.

Consider what makes a piece of code easy to reuse in different places.