You can expect to learn about what questions you should ask, what answers to expect, and what to focus on evaluating for each answer. Additionally, we\u2019ll give you the reasoning behind why you should ask these questions and what to look for: why should you ask these questions? What do you want to know by asking your candidates these questions? How can you draw out better answers from your candidates?<\/em><\/p>\n\n\n\n Let\u2019s get started!<\/p>\n\n\n\n Looking to hire the best remote developers? Arc can help you:<\/em><\/p>\n\n\n\n \u26a1\ufe0f Get instant candidate matches without searching Try Arc to hire top developers now \u2192<\/strong><\/em><\/a><\/p>\n\n\n\n The following set of Vue.js interview questions should test the candidate\u2019s basic knowledge of Vue and some of its core features.<\/p>\n\n\n\n All front-end frameworks have a different component system to handle the UI layer. The interviewer might ask this question to gain an understanding of the candidate\u2019s knowledge of components in general and how they play an important role when building front-end applications. The candidate should also be able to explain at a high level the role and advantages of components within the Vue framework.<\/em><\/em><\/p>\n\n\n\n Components<\/strong> are the basic building blocks of the user interface of every application. Components allow us to split the UI into smaller, independent, and reusable pieces.<\/p>\n\n\n\n The concept of components isn\u2019t Vue specific, however, Vue has its own component model that provides encapsulation of the content and logic within each component.<\/p>\n\n\n\n This beginner\u2019s Vue interview question is likely to be a follow-up to the previous question regarding components in Vue. The candidate should be able to explain the two approaches to create a component in Vue along with their differences and applications<\/em><\/em><\/p>\n\n\n\n There are two ways to create a component in Vue. Depending on whether we have a build step or not, we can either use a single-file component or a JavaScript object.<\/p>\n\n\n\n When using a build step, we typically use a single-file component<\/strong>. The Vue component is placed in a single dedicated file using the `.vue` extension.<\/p>\n\n\n\n Without a build step, the Vue component can be defined as a plain JavaScript object<\/strong> containing Vue-specific options. The snippet below is the same single-file component converted into a JavaScript object.<\/p>\n\n\n\n Read More<\/strong>: Important Questions to Ask Hiring Managers Before Committing to the Developer Employment Process<\/a><\/p>\n\n\n\n Props are one of the most basic ways of passing data between components in Vue. As with the previous Vue JS interview questions, the developer candidate should be able to explain what props are and how they\u2019re used to communicate between different components. Don\u2019t forget to draw out a couple of examples to demonstrate its usage in a real application.<\/em><\/em><\/p>\n\n\n\n When building an application, you often end up building a component tree with a hierarchy of components. Oftentimes, you will need to pass data between the components as you go down the tree. These are where props come into play.<\/p>\n\n\n\n Props<\/strong> (or properties) are custom attributes you can register in a component. They are used to pass data from a parent component to its child components. When a value is passed as a prop attribute, it becomes a property on the component instance and can be accessed using the The example below shows how the prop Component communication is an important aspect of every application. An ideal front-end developer job candidate should be able to explain the basic ways components can communicate with each other along with their respective applications.<\/em><\/em><\/p>\n\n\n\n Vue uses props<\/strong> and events<\/strong> to communicate between components.<\/p>\n\n\n\n Data is passed from the parent component to its child using a prop or a custom attribute. This then becomes a property on the child component instance. The following snippet shows us how the parent component passes a prop named On the other hand, the children components use an event to communicate back to their parents. The parent can listen to these events by attaching an event listener to any event the child emits. <\/p>\n\n\n\n The snippet below shows how the child component emits a Read More<\/strong>: Common Interview Questions for Software Developer Jobs (Non-Technical)<\/a><\/p>\n\n\n\n This is another component-related Vue.js question that you might ask your candidate. Slots are a useful feature of Vue\u2019s components that gives the developers a lot of flexibility in building a robust and reusable set of components. You may ask this Vuejs interview question to gauge the candidate\u2019s level of familiarity with how Vue components work.<\/em><\/em><\/p>\n\n\n\n Slot<\/strong> is another way a parent component can pass in content to its children. However, instead of JavaScript values, slots allow us to pass in template content or fragments to another component.<\/p>\n\n\n\n For example, a The Vue replaces the Struggling with interview prep? Meet senior developers from Amazon, Microsoft, and Google now on Codementor. They\u2019ll help you tackle coding challenges, practice interviews, and sharpen your skills in live 1:1 sessions. Explore our other software development interview questions and answers to prep for your next remote job.<\/p>\n\n\n\n This is a possible follow-up to the previous Vue interview questions regarding slots. Fallbacks are useful when there is a possibility that a component doesn\u2019t pass in any content for a slot. You might ask this to gauge the candidate\u2019s familiarity with slots. The candidate should be able to explain what a slot fallback content is and also provide real use cases where fallback content would be beneficial.<\/em><\/em><\/p>\n\n\n\n Fallback or default content for a slot is rendered only when no content is provided. This adds more flexibility when creating and using slots as fallback content allows passing in optional content.<\/p>\n\n\n\n The fallback content is the template defined within the Let’s look at an example of a Below are the two use cases of the Read More<\/strong>: How to Show Off Your Soft Skills at Software Engineering Interviews<\/a><\/p>\n\n\n\n Applications typically involve updating and keeping the template in sync with your component\u2019s properties. For this lower-difficulty Vue interview question, a dev job candidate should be able to explain what attribute binding is and how they work at a high level.<\/em><\/em><\/p>\n\n\n\n Vue uses the For example, an element’s Vue\u2019s two-way binding system is one of the most powerful and useful features of Vue when handling user input. The two-way binding system is also not limited to just text input but also works with other form components such as radio buttons and checkboxes. A Vue developer job candidate should be able to explain what two-way binding is and how Vue leverages<\/em> the Vue simplifies user input handling and synchronization by using the Let’s look at an example of how to apply two-way binding on the Read More<\/strong>: Best Questions to Ask at a Job Interview<\/a><\/p>\n\n\n\n Directive is one of Vue\u2019s core features that gives front-end software developers the ability to add custom behavior to a component. A candidate should be able to explain what a directive is and what its purpose is. Ask your candidate to give examples of use cases of Vue’s built-in directives and when creating custom directives is appropriate.<\/em><\/em><\/p>\n\n\n\n Directive<\/strong> in Vue is similar to that of Angular’s. Directives provides a way to extend the HTML components with new attributes and tags. Directives are mainly intended for reusing logic that involves low-level DOM access on plain elements.<\/p>\n\n\n\n Vue provides a set of built-in directives to help developers with common use cases. Below are the commonly used directives along with their behavior:<\/p>\n\n\n\n Directive is a powerful feature of Vue as discussed in the previous question. This is another directive question that leans more toward the application side of it. The candidate should be able to demonstrate how directives can be used with multiple values \u2013 how they are passed in and how the directive accesses them.<\/em><\/em><\/p>\n\n\n\n A directive accepts any valid JavaScript expression including objects. Thus, a JavaScript object literal could be used when a directive requires multiple values.<\/p>\n\n\n\n Let’s look at an example of a directive The snippet below shows how the object literal is used to pass in the The snippet below shows how the Read More<\/strong>: 10 Fast-Growing Remote Startups Hiring Now<\/a><\/p>\n\n\n\n Before we wrap this part up, here are a few other easy Vue interview questions you may want to include in your interviews:<\/p>\n\n\n\n The following set of medium-difficulty Vue JS interview questions should test the candidate\u2019s intermediate knowledge of Vue and some of its widely used features.<\/p>\n\n\n\n Being able to communicate effectively between different components is an important aspect of building applications. There are numerous ways to communicate and events is one of the commonly used approaches to communicate from a child to its parent component. Your candidate should explain what an event is and how it can be used as a communication tool. They should explain both sides of its usage \u2013 the component emitting the event and the component listening to it.<\/em><\/em><\/p>\n\n\n\n Vue’s component instances provide a custom events system to simplify communication between a child component and its parents. A component can emit custom events using the built-in The parent component can then listen to the emitted event using the Slots are a great way to compose reusable components. Knowing the different types of slots will help you decide which ones to use given the use case. A hiring manager might ask this Vue.js question to gain an insight into the candidate\u2019s level of understanding of building components using Vue\u2019s features.<\/em><\/em><\/p>\n\n\n\n A slot<\/strong> is a placeholder in a child component that is filled with content passed from the parent. A limitation of using regular slots lies in accessing child component properties. A regular slot is compiled within its parent’s scope and passed to the child component. This process restricts the use of child component properties from within a slot’s content.<\/p>\n\n\n\n Scoped slot,<\/strong> on the other hand, allows you to pass child component data to the parent scope and use the data in the slot content.<\/p>\n\n\n\n Read More<\/strong>:
\u26a1\ufe0f Identify top applicants from our network of 350,000+
\u26a1\ufe0f Hire 4x faster with vetted candidates (qualified and interview-ready)<\/em><\/p>\n\n\n\nBasic Vue JS Interview Questions<\/h2>\n\n\n\n
1. What are components in Vue?<\/h3>\n\n\n\n
2. How do you create components in Vue?<\/h3>\n\n\n\n
<script>\nexport default {\n data() {\n return {\n name: 'Bob'\n }\n }\n}\n<\/script>\n\n<template>\n <h1>Hello {{ name }}<\/h1>\n<\/template>\n<\/code><\/pre>\n\n\n\nexport default {\n data() {\n return {\n name: 'Bob'\n }\n },\n template: `\n <h1>Hello {{ Bob }}<\/h1>\n `\n}<\/code><\/pre>\n\n\n\n3. What are Props in Vue?<\/h3>\n\n\n\n
this<\/code> keyword.<\/p>\n\n\n\nfoo<\/code> is declared and accessed in a component.<\/p>\n\n\n\nexport default {\n props: ['foo'],\n created() {\n console.log(this.foo)\n }\n}<\/code><\/pre>\n\n\n\n4. Describe how the data flows between components in a Vue.<\/h3>\n\n\n\n
title<\/code> to the ChildComponent<\/code>.<\/p>\n\n\n\n<ChildComponent title=\"Hello!\" \/><\/code><\/pre>\n\n\n\nchildevent<\/code> when the button is clicked and how the parent listens to the event by attaching a callback to the event.<\/p>\n\n\n\n<!-- child.vue -->\n<button @click=\"$emit('childevent')\">click me<\/button>\n\n<!-- parent listening to the event -->\n<ChildComponent @childevent=\"callback\" \/><\/code><\/pre>\n\n\n\n5. What are slots?<\/h3>\n\n\n\n
FancyHeader<\/code> component wraps the template content passed by the parent component in an h1<\/code> tag and adds some custom styling.<\/p>\n\n\n\n<FancyHeader>\n Hello! <!-- slot content --><\/em>\n<\/FancyHeader><\/code><\/pre>\n\n\n\nFancyHeader<\/code> template can then place the slot content anywhere within its template by using the <slot><\/code> tag.<\/p>\n\n\n\n<h1 class=\"fancy-header\">\n <slot><\/slot> <!-- slot outlet --><\/em>\n<\/h1><\/code><\/pre>\n\n\n\n<slot><\/code> tags with the slot content passed from the component’s parent, creating the following rendered DOM.<\/p>\n\n\n\n<h1 class=\"fancy-header\">\n Hello!\n<\/h1><\/code><\/pre>\n\n\n\n
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Book a session with our interview prep tutors<\/a> today! Your first 15 minutes are free.<\/strong><\/p>\n\n\n\n\n
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\n\n\n\n6. How do you add fallback content for slots?<\/h3>\n\n\n\n
slot<\/code> tags. This template will be ignored and replaced with the passed-in content (if present).<\/p>\n\n\n\nGreetingComponent<\/code> that displays an h2<\/code> element with default text when no template is passed within the greeting component tag.<\/p>\n\n\n\n<div class=\"greeting\">\n <slot>\n <h2>Hello<\/h2> <!-- fallback content --><\/em>\n <\/slot>\n<\/div>\n<\/code><\/pre>\n\n\n\nGreetingComponent<\/code>.<\/p>\n\n\n\n\n
<GreetingComponent>\n <h1>Whats up?<\/h1>\n<\/GreetingComponent>\n\n<!-- will generate the following output --><\/em>\n<div class=\"greeting\">\n <h1>Whats up?<\/h1>\n<\/div><\/code><\/pre>\n\n\n\n\n
<GreetingComponent><\/GreetingComponent>\n\n<!-- will generate the following output --><\/em>\n<div class=\"greeting\">\n <h2>Hello<\/h2>\n<\/div><\/code><\/pre>\n\n\n\n7. What are attribute bindings in Vue?<\/h3>\n\n\n\n
v-bind<\/code> directive or its short-form :<\/code> to instruct Vue that the property should be kept in sync with the component’s property of the same name.<\/p>\n\n\n\nid<\/code> can be bound to a dynamic id (dynamicId<\/code>) by using either of the syntaxes below.<\/p>\n\n\n\n<!-- v-bind directive --><\/em>\n<div v-bind:id=\"dynamicId\"><\/div>\n\n<!-- short form --><\/em>\n<div :id=\"dynamicId\"><\/div><\/code><\/pre>\n\n\n\n8. How do you create two-way bindings in Vue?<\/h3>\n\n\n\n
v-model<\/code> directive to handle the data synchronization.<\/em><\/p>\n\n\n\nv-model<\/code> directive. The v-model<\/code> directive updates the model whenever the template changes and updates the template when the model changes.<\/p>\n\n\n\nname<\/code> variable. To bind the value of an input element to a property of your component\u2019s data, set the v-model<\/code> to the property name.<\/p>\n\n\n\nexport default {\n data() {\n return {\n name: 'Bob'\n }\n },\n template: `\n <h2>Hello {{ name }}<\/h2>\n <input v-model=\"name\"\/>\n `\n}<\/code><\/pre>\n\n\n\n9. What are directives in Vue?<\/h3>\n\n\n\n
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v-show<\/code> – toggles the element’s visibility<\/li>\n\n\n\nv-if<\/code> – conditionally render an element or a template fragment<\/li>\n\n\n\nv-else<\/code> – the else block to v-if<\/code><\/li>\n\n\n\nv-for<\/code> – renders the element or template block multiple times based on the source data<\/li>\n<\/ul>\n\n\n\n10. How do you pass multiple values to a directive?<\/h3>\n\n\n\n
user<\/code> that expects a user’s name<\/code> and age<\/code> as its inputs.<\/p>\n\n\n\nname<\/code> and age<\/code> values.<\/p>\n\n\n\n<div v-user=\"{ name: 'Bob', age: 30 }\"><\/div><\/code><\/pre>\n\n\n\nname<\/code> and age<\/code> values are extracted from the directive<\/p>\n\n\n\napp.directive('user', (el, binding) => {\n console.log(binding.value.name) \/\/ => \"Bob\"<\/em>\n console.log(binding.value.age) \/\/ => \"30\"<\/em>\n})<\/code><\/pre>\n\n\n\nMore Beginner Vue Interview Questions to Practice<\/h3>\n\n\n\n
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<\/a><\/figure>\n\n\n\nIntermediate Vue Interview Questions<\/h2>\n\n\n\n
1. How do you use events<\/strong> to communicate between Vue components?<\/h3>\n\n\n\n
$emit<\/code> function.<\/p>\n\n\n\n<!-- child --><\/em>\n<button @click=\"$emit('some-event')\">Emit some event<\/button><\/code><\/pre>\n\n\n\nv-on<\/code> directive or the @<\/code> symbol.<\/p>\n\n\n\n<!-- parent --><\/em>\n<ChildComponent @some-event=\"callback\" \/><\/code><\/pre>\n\n\n\n2. Explain the differences between slots<\/strong> and scoped slots<\/strong>.<\/h3>\n\n\n\n