Are you preparing for a Vue.js interview? If yes, you’ve landed on the right page. In this post, dive into the latest Vue.js Interview Questions for Beginners and Professionals. Go through those interview questions and grab that job like a pro.
Keeping its popularity in mind, a plethora of organisations have started actively hiring for Vue.js vacancies. Thus, if you’ve been preparing for a job interview in this domain, this article will guide you through some of the best and latest Vue.js Interview Questions for Beginners and Professionals. Let’s get started.
Our team curated Vue.js Interview Questions as follows
Frequently Asked Vue.js Interview Questions
Ans: Data is passed from the parent component to the child component using Component Prop. A component can have as many props as it wants. The prop is a custom attribute that becomes a property on the component instance when a value is supplied.
From parent to a child component, a component Prop forms a one-way down binding. When the parent's property changes, it affects the child, but not the other way around.
Ans: Reactivity – When you change the data value, the page is updated to reflect the changes. Data properties and computed properties in Vue are reactive. Vue.js services are not reactive. Visit Reactivity in Vue.js for additional information.
Ans: Lifecycle hooks are functions that every Vue instance runs through. Each vue has eight lifecycle hooks. An instance of js
Ans: The items are shown or hidden using v-show and v-if. However, there are some distinctions. The v-if directive is used to render a block conditionally. It features lazy behaviour, which means that if the initial condition is false, the block will not be rendered until it changes. During a condition change, v-if destroys and recreates the elements.
When your condition does not frequently change at runtime, use the v-if directive because it has a lower initial render cost but a higher toggling cost.
The v-show directive can also be used to render a block conditionally. The element is always rendered by v-show. Instead of removing the element or block from the DOM, it simply sets the CSS show attribute.
It has a high initial rendering cost but a low toggle cost, so use the v-show directive if you need to toggle frequently.
Ans: In the child component, $parent is used to retrieve the parent component instance. It's more challenging to test and debug the programme, and you can't figure out where the mutation comes from. Vue also has a $child function that returns a child component instance, similar to $parent.
Ans: SFCs, or Single File Components, are similar to other components in that they are self-contained in their own files. The following are some of the benefits of SFCs.
Ans: The primary components of state management are state, view, and actions.
The components are described in full below.
Ans: It will be easy to test mutations because they are simply functions that rely only on their arguments. You must keep mutations contained within your store.
The mutations should also be exported as a named export, apart from the default export.
Ans: Creating a computed property whenever we wish to use the store's state property or getter in a Vuex application will be repetitive and lengthy, especially if a component requires many state properties.
Ans: No, it isn't required. However, you may have noticed that state management frameworks like Flux and Redux employ constants for mutation types. This is just a preference, but it's beneficial to use tooling like linters, and putting all constants in a single file lets your collaborators see what modifications are allowed across the entire application at a glance.
Ans: The primary features of Vue CLI are listed below.
Ans: With the vue serve(similar to vue create) and vue build commands in the Vue CLI, instant prototyping is known as fast prototyping with just a single *.vue file.
Ans: After the data has been set and the DOM changed, the nextTick method is simply a convenient mechanism to perform a function.
Ans: Instead of just supplying the object, the component data must be a function. This is because each instance requires a copy of the returned data object. Otherwise, data changes in one component instance will affect data in all other instances.
Ans: Vue-navigation router's guards protect navigations by diverting or cancelling them.
The three possible techniques to plug into router navigations are listed below.
Ans: Mixins are a versatile approach to sharing reusable Vue component functionality. Any component choices can be included in a mixin object. When a component employs a mixin, all of the mixin's options are "mixed" into the component's own.
Ans: Mixins are used by developers in Vue.js to flexibly distribute reusable features. Mixins can have any number of component options. Mixins can be kept in one location so that all of the components that use them benefit at the same time.
Ans: The following directives are supported in Vue js:
Ans: Vue-loader is a webpack loader plugin that allows us to develop single-file components in the vue format. Template, script, and style are the three sections of a single component file. Webpack can extract and process each section using distinct loader modules like the SASS or SCSS loaders, thanks to the vue-loader module. As a result of the configuration, we can easily author apps using.vue files.
Static assets can also be regarded as module dependencies with the vue-loader module, and webpack loaders can be used to process them. It also enables hot reloading when developing.
Vue overcomes this problem by storing a virtual representation of the document's structure in memory, where a virtual node (vnode) represents nodes in a document's structure. When manipulation is required, the computations and operations are executed in memory on the Virtual DOM rather than on the real DOM. This is faster, and it allows the Virtual DOM algorithm to determine the most efficient method of updating the actual DOM structure.
This is then applied to the actual DOM tree after it has been computed. This improves performance, which is why Virtual DOM-based frameworks like Vue and React have become so popular.
Ans: Developers can create and add global level functionality to Vue via a Vue plugin. This can be used to add globally accessible methods and properties to an application and assets, options, mixins, and other custom APIs. VueFire, a Vue plugin that adds Firebase specific methods and binding to the entire application, is an example of a Vue plugin.
Ans: Managing state becomes tough when an application increases in size, both in terms of features, codebase and employing an eternal network of downstream props and upstream events is not sensible. It becomes vital to transfer state management to a central management system in such a situation. Vuex is the official state management library and a suggested paradigm for saving states centrally in the Vue ecosystem.
Vuex allows for the preservation of a central state. Vuex is used by components as a reactive data store, which updates as the state changes. The same and central state store can be used by multiple and unrelated components.
Ans: Your Vue application may become delayed for various reasons:
Ans: When a Vue component instance is created, it goes through several setup procedures. It must set up data observation, compile the template, mount the instance to the DOM, and update the DOM when data changes, for example. It also runs lifecycle hooks along the route, which allow us to run custom code at specific points in the process.
Ans: Because arrow functions are not self-contained, they cannot define a 'this' of their own. The arrow functions are confined to the context of their parent function.
The keyword 'this' does not bind to the Vue instance when the arrow function (=>) is used in the Vue app, resulting in problems.
As a result, instead of using the arrow function, you strongly recommend utilising the regular function declaration.
Ans: Instead of utilising computed properties, watchers are a more generic way to react to data changes.
When asynchronous or expensive actions must be performed in response to changing data, they should be employed.
Ans: Because of its vast built-in functionalities and community support, Angular is an obvious choice for developing enterprise-based applications. When it comes to creating user interfaces and tackling complicated problems, Vue is a technically sound framework.
Knowing what you can expect in the interview surely helps you prepare and perform well. Now that you have a comprehensive list of Vue.js interview questions for beginners and professionals, refer to them while preparing. Lastly, stay confident and showcase your knowledge like a professional.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .
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