Vue Js Project Components 1 — Questions and Answers

Question 1: Which modifier is really helpful for enhancing the functionality of mobile devices?

.constant
.capture
.passive (Correct answer)
.directive

Correct answer: .passive

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?

v-model (Correct answer)
v-for
[]
v-on

Correct answer: v-model

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?

Const (Correct answer)
Constant
Cnst
None of the above

Correct answer: Const

`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.

Handler
Data
Key
Target (Correct answer)

Correct answer: Target

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.

Target
Key
Data
Handler (Correct answer)

Correct answer: Handler

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.

Question 6: This is used to add/create HTML components in the template property of the Vue instance.

Double Quotes
Directives
String Interpolation
Template String Literal (Correct answer)

Correct answer: Template String Literal

Template string literals, enclosed by backticks (`` ` ``), are a JavaScript feature often used in Vue.js to define multi-line HTML templates within the `template` option of a component or instance. They allow for easy embedding of expressions and multi-line strings, making it convenient to define the structure of HTML components directly in JavaScript.

Question 7: The Vue template is rendered with the property value and accompanying data object using this tag.

Brackets
String Literals
Braces
Mustache (Correct answer)

Correct answer: Mustache

In Vue.js, the 'Mustache' syntax, denoted by double curly braces `{{ }}`, is used for declarative data rendering in templates. It allows you to embed JavaScript expressions that are then evaluated and displayed as plain text in the DOM, serving as the primary way to bind data properties from the Vue instance to the template.

Vue Js Project Components 1

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