# Vue Interview Questions for Developers

Use our engineer-created questions to interview and hire the most qualified Vue developers for your organization.

## Vue

Known among developers for its extremely low learning curve and flexibility, Vue continues to attract users to its component-based architecture, reactive data binding, and robust ecosystem.

> According to the [CoderPad 2024 Developer survey](/content/interview-questions/backend-interview-questions/index.html), Vue is the third most in-demand front-end framework among technical recruiters.

Outlined below are hands-on coding tasks and interview inquiries designed to assess developers’ proficiency in Vue during technical interviews. Furthermore, a compilation of best practices is provided to guarantee that your interview questions accurately measure the Vue abilities of your candidates.

## Table of Contents

## **Vue example question**

### **Create a reusable input component**

Complete the simple input component implemented in `components/BaseInput.vue` to make this page work. Your goals:

- Implement two-way data binding so the `BaseInput.vue` can be used for entering data by using the v-model directive.
- Conditionally render the value that has been entered into the input when it is not empty.

## Junior Vue interview questions

**Question:** Explain the concept of data binding in Vue.js and provide an example of two-way data binding.

**Answer:** Data binding in Vue.js is the process of establishing a connection between the data in the Vue instance and the DOM elements. It allows for automatic synchronization between the data and the user interface. When the data changes, the UI updates accordingly, and vice versa.

An example of two-way data binding in Vue.js is using the `v-model` directive. It binds a form input element to a Vue instance data property, allowing changes in the input to update the data property and changes in the data property to update the input.

```xml
<template>
  <input v-model="message" type="text">
  <p>{{ message }}</p>
</template>

<script>
export default {
  data() {
    return {
      message: ""
    };
  }
};
</script>Code language: HTML, XML (xml)
```

In this example, the value entered in the input field will be immediately displayed in the paragraph below it due to the two-way data binding using `v-model`.

**Question:** Explain the purpose of Vue.js directives and provide an example of a custom directive.

**Answer:** Directives in Vue.js are special attributes that provide additional functionalities to the DOM elements they are attached to. They start with the `v-` prefix and are used to perform various tasks, such as data binding, conditional rendering, event handling, and more.

Here’s an example of a custom directive that adds a “shake” effect to an element when a certain condition is met:

```xml
<template>
  <button v-shake="shouldShake">Click Me</button>
</template>

<script>
export default {
  data() {
    return {
      shouldShake: false
    };
  },
  directives: {
    shake: {
      bind(el, binding) {
        el.style.transition = "transform 0.2s";
      },
      update(el, binding) {
        if (binding.value) {
          el.style.transform = "translateX(10px)";
        } else {
          el.style.transform = "translateX(0)";
        }
      }
    }
  }
};
</script>Code language: HTML, XML (xml)
```

In this example, we create a custom directive called `v-shake`. The directive is bound to a button element and checks for changes in the `shouldShake` data property. When `shouldShake` becomes true, the button shakes by translating it 10 pixels to the right.

**Question:** Explain the concept of components in Vue.js and provide an example of creating and using a component.

**Answer:** Components in Vue.js are reusable and self-contained units of code that encapsulate the template, logic, and styles for a specific UI element. They enable better code organization and reusability by breaking the application into smaller, manageable pieces.

Here’s an example of creating and using a simple component in Vue.js:

```xml
<template>
  <div>
    <h1>{{ title }}</h1>
    <p>{{ content }}</p>
  </div>
</template>

<script>
export default {
  props: {
    title: String,
    content: String
  }
};
</script>Code language: HTML, XML (xml)
```

To use this component in another Vue instance:

```xml
<template>
  <div>
    <my-component title="Hello World" content="Welcome to my Vue.js app"></my-component>
  </div>
</template>

<script>
import MyComponent from "@/components/MyComponent.vue";

export default {
  components: {
    MyComponent
  }
};
</script>Code language: HTML, XML (xml)
```

In this example, we create a component named `MyComponent` with two props: `title` and `content`. The component receives these props from the parent Vue instance and displays them in the template.

## Interview practices for Vue roles

Interview experiences for Vue candidates can vary greatly depending on factors like the specific engineering position and the applicant’s level of expertise. To optimize the efficacy of your Vue interview questions, we recommend adhering to these best practices when interacting with your candidates:

- Frame technical questions around real-world situations within your organization – this not only makes the interview more engaging for the applicant but also better illustrates the suitability of their skills for your team.
- Encourage a cooperative atmosphere by welcoming the candidate to ask questions during the exercise.
- In the case of evaluating Vue for a full-stack role, ensure that candidates understand how to incorporate the front-end features and requirements in the rest of the stack.

Furthermore, it’s vital to adhere to standard interview guidelines while conducting Vue interviews – tailor the difficulty of interview questions to the applicant’s development skill level, offer prompt feedback about their status in the recruitment process, and set aside ample time for candidates to ask about the assessment or the experience of collaborating with you and your team.