The hiring process can be challenging, from finding the right talent to asking incisive interview questions and working out the contract details. If you're unfamiliar with Vue.js, you'll likely have even more challenges. Interviews happen in multiple stages, and as the hiring manager or team lead, you must understand each step and the right questions to ask throughout the process.
To be prepared for an interview, you'll need to clearly understand what the role entails and the skills and education required for the projects your hire will be expected to complete. You’ll need to ask specific questions to discern their abilities and ensure they’ll fit your company culture well.
If you're uncertain about the interview process or what Vue.js interview questions and answers to expect, Revelo can help. Our services can help you find candidates, schedule interviews, and provide coaching throughout the interview process to ensure it goes as smoothly as possible.
What Is Vue.js?
Vue.js, often shortened to Vue, is a progressive and open-source JavaScript framework. Evan You created it in 2014 to counter heavier frameworks like React and AngularJS. Vue is based on JavaScript and Angular, and the core library focuses on the view layer. It is meant to be gradually implemented into projects and provides developers with several built-in features. It's easy to use, operates via a single syntax, and can be built with HTML, CSS, and JavaScript.
Advantages of using Vue include:
- Simple learning curve
- Easy to get started
- Expansive official libraries
- Quick and efficient rendering
- Collaborative community
Vue developers work within the Vue framework and manage the front-end development of web applications. Developers can use Vue to design and build innovative web applications, build transitions and animations, integrate Vue with existing projects, develop reusable libraries and components, and test and update applications for performance and safety.
Vue.js Interview Questions
If you're looking to hire Vue.js developers for your team or a professional who understands Vue.js and the industry, you should know what questions to ask and what answers to expect.
Below are some general Vue.js interview questions.
What is Vue.js?
While this question may seem obvious when hiring a Vue.js developer, it gets straight to the point and determines which developers are knowledgeable about this framework.
Vue.js is a progressive JavaScript framework meant to be used in increments. It allows developers to build functional web applications and single-page applications. Because its main library primarily focuses on the view layer, Vue.js can be integrated with other libraries and projects. Aside from its main library, Vue.js also has companion libraries focusing on routing and state management.
Vue.js also allows faster DOM rendering, server-side rendering, and client-side routing and comes equipped with various tools to help developers build applications.
What are the primary features of Vue.js?
This question allows you to determine how much a developer knows and understands about Vue.js. Any Vue developer, regardless of skill level, should have a good understanding of the primary features of the framework.
Look for a developer who can provide insight into the framework's features. For example, Vue.js has several features that developers love. The main ones include:
- Built-in directives: Vue.js has a wealth of built-in directives that, once inserted, instruct Vue to do things in a specific way. An example of a built-in directive is v-text, which updates the element's text content.
- Components: Components combine JavaScript objects with HTML-based template syntax. They are native APIs and are used to create custom elements. Vue.js' components can be reused.
- Data binding: Data binding allows developers to manage HTML attributes more efficiently. Developers can manipulate HTML attributes, assign values or classes, change styles, and more.
- Virtual DOM: Vue.js gives developers access to a virtual DOM, a clone of the main DOM that can be used to test changes before going live.
What are the most important directives in Vue.js?
Directives are a significant feature in Vue.js, and you’ll want to ensure that the developer you hire understands what they are and which ones are most important.
For example, some of the most important directives in Vue.js include the following:
- v-if: Allows DOM elements to be added or removed, depending on given expressions
- v-else: Shows content when the adjacent v-if expression is false
- v-show: Renders elements to the DOM, then uses the CSS display property to reveal or hide elements
- v-for: Loops through items in arrays or objects
- v-model: Allows two-way data bindings
- v-on: Joins together event listeners and elements
Vue.js Developer Entry-Level Interview Questions
Interview questions should be tailored toward the level of developer you’re hiring. Below are some entry-level interview questions to ask a Vue.js developer who may be working on a smaller project.
What is an SFC?
Single-file components (SFCs) are a Vue file format; entry-level developers should understand what these are and what they’re used for. Your candidate should be able to give you an answer, such as SFC stands for "single-file component." This file format allows you to summarize the template, logic, and style into a single file. SFCs require pre-compiling into standard JavaScript and CSS before they can be used.
What are computed properties?
Vue.js has templates that can be used, but these templates can become oversaturated and challenging to handle. Computed properties help with this, and entry-level developers should understand what they are and how they can help templates.
Look for someone who can tell you that computed properties allow you to easily remove unnecessary logic and reactive data from the template; they are cached and only re-examined templates when reactive dependencies are altered.
What are watchers?
As mentioned previously, entry-level Vue developers should understand Vue features well, including watchers.
Candidates should be able to tell you that watchers are special features allowing you to view data changes and computed properties. They also allow code to be executed in response to these changes.
Mid-Level Vue.js Developer Interview Questions
For mid-level Vue.JS developers, the questions should touch more heavily on certain prominent features in Vue.js. These questions can help you gauge a developer’s actual skill in Vue.
How are events used to communicate between Vue components?
Communication between Vue components is simplified thanks to events, which can be used to communicate between a child and parent component. Child components can use the built-in $emit feature to communicate to their parent component, at which point the parent component will use the V-on directive or @ symbol to listen.
When dealing with the Vue.js framework, developers will have to use events. Mid-level developers should understand how to communicate these events between Vue components, specifically between a parent and child component.
What are Vue filters?
Filters are functions in Vue.js that allow you to modify the data outputs. They're often used to modify text and formatting. There are two ways you can define filters: local filters, which are defined in a component's options and allow the filter to apply to specific components, and global filters, which enable you to define a filter globally before developing an instance and allowing the filter to be applied to all components.
Experienced Vue.js developers should have plenty of experience dealing with Vue filters. As such, they should be able to explain what these filters are and what they’re used for. This can help determine a candidate’s expertise and experience with the Vue framework.
Why should a key attribute be used for directives?
Key attributes allow you to track a node's identity and easily reuse and reorder elements. Key attributes must be unique to each item within a directive, and it's recommended that string or numeric values be used as opposed to arrays, objects, and other non-primitive values.
A mid-level Vue developer should have plenty of experience handling directives, as they are critical to the Vue framework. This question can help you determine your candidate’s experience.
Senior Vue.js Developer Interview Questions
Finally, when interviewing a senior-level Vue.js developer, you’ll benefit from asking questions that invite the candidate to show the depth of their technical knowledge.
What is Vuex?
Vuex is Vue.js' state management pattern and library. It's a central store for all components and has rules that guarantee that the state can be modified only in a predictable way.
Vuex is an integral part of the Vue.js framework. A developer should be able to explain what it is and how it’s accessed and used, and you should get a feel for their sound technical knowledge.
What is a state management pattern?
The state management pattern consists of state, view, and action components. The state handles the source of truth; the view is a declarative mapping of the state; and the actions are the potential methods that the user inputs could change, depending on the reaction.
As a senior-level developer, your candidate should be able to answer this question effortlessly and even give examples of what it’s used for.
What are lazy loading translations?
Loading all translations may negatively affect performance and is usually unnecessary. Lazy loading lets you dynamically load or import language translations as needed, generally using a webpack.
Senior-level developers will have encountered problems and defects during the projects they’ve worked on within the Vue framework, including those dealing with translations. As such, they should have plenty of experience with lazy loading translations and using them to help improve overall performance. This question can help you determine which candidates understand how critical performance is and how they prioritize it.
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