Vue Js Project Components 1

Question 1

Which modifier is really helpful for enhancing the functionality of mobile devices?

Accepted Answer

.passive

Answer

The `.passive` event modifier is crucial for enhancing scrolling performance on mobile devices. It informs the browser that the event listener will not call `preventDefault()`, allowing the browser to perform its default scrolling behavior immediately. This prevents potential jank and ensures a smoother user experience, especially for touch and scroll events.

Question 2

Which directive is employed when two-way binding is desired?

Accepted Answer

v-model

Answer

The `v-model` directive is specifically designed for two-way data binding on form input elements, textareas, and select elements. It creates a binding where the input's value updates the data property, and changes to the data property automatically update the input's value. This simplifies the synchronization between the UI and the underlying data model.

Question 3

In vue.js, what keyword is used to construct a constant?

Accepted Answer

Const

Answer

`const` is the standard JavaScript keyword used to declare a constant, whose value cannot be reassigned after its initial declaration. Since Vue.js applications are built using JavaScript, this keyword is fundamental for defining constant values within Vue components and instances.

Question 4

It contains the original object being proxied in JavaScript.

Accepted Answer

Target

Answer

In the context of a JavaScript Proxy object, the `target` refers to the original object that is being wrapped or 'proxied.' The Proxy object intercepts operations performed on this `target` and allows for custom behavior to be defined.

Question 5

An object that specifies the operations that will be blocked.

Accepted Answer

Handler

Answer

In JavaScript's Proxy API, the `handler` is an object that contains 'trap' methods, which define the custom behavior for operations performed on the Proxy. These traps can intercept and modify fundamental operations like property access, assignment, or function invocation, effectively controlling or 'blocking' default behaviors.

Vue JS Practice Test

Vue JS Practice Test

Vue Js Project Components 1