Vue.js Component Basics Quiz
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Question 1/15
What is the purpose of the 'data' function in a Vue component?
Select your answer
Question 2/15
What is a Vuex store used for in a Vue.js application?
Select your answer
Question 3/15
How do you loop through an array in a Vue template?
<!-- Vue template -->
<ul>
<li v-for="item in items" :key="item.id">{{ item.name }}</li>
</ul>
Select your answer
Question 4/15
How do you bind an event listener to a button click in Vue?
<!-- Vue template -->
<button @click="handleClick">Click me</button>
Select your answer
Question 5/15
How can you specify a default value for a prop in Vue.js?
props: {
myProp: {
type: String,
default: 'Default Value'
}
}
Select your answer
Question 6/15
How do you emit an event from a child component in Vue?
// In child component
this.$emit('myEvent', payload);
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Question 7/15
When would you use a 'watcher' in Vue.js?
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Question 8/15
What lifecycle hook would you use to fetch data when a component is created?
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Question 9/15
What is a scoped slot in Vue?
<template #default="slotProps">
<span>{{ slotProps.text }}</span>
</template>
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Question 10/15
What does the 'props' option in a Vue component do?
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Question 11/15
How do you pass a string prop to a child component in Vue.js?
// Parent component template
<child-component :message="'Hello'" />
Select your answer
Question 12/15
Which directive is used for conditional rendering in Vue.js?
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Question 13/15
How would you register a component globally in Vue?
Vue.component('my-component', {
template: '<div>A custom component!</div>'
});
Select your answer
Question 14/15
How do you configure a CSS class for an active state using Vue Router?
<router-link to="/home" active-class="active-link">Home</router-link>
Select your answer
Question 15/15
How do you handle form submissions in Vue.js?
<!-- Vue template -->
<form @submit.prevent="submitForm">
<!-- form controls -->
</form>
Select your answer
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Your Answers
Question 1/15
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answer was correct
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answer was incorrect
What is the purpose of the 'data' function in a Vue component?
Available answers
The 'data' function in a Vue component returns an object. This object is reactive, meaning that Vue will automatically update the DOM when these properties change. It is used to store the component's state.
Question 2/15
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answer was correct
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answer was incorrect
What is a Vuex store used for in a Vue.js application?
Available answers
A Vuex store is a centralized state management solution for Vue.js applications. It allows for managing the global state across components to keep data in sync and consistent.
Question 3/15
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answer was correct
🙁 Your
answer was incorrect
How do you loop through an array in a Vue template?
<!-- Vue template -->
<ul>
<li v-for="item in items" :key="item.id">{{ item.name }}</li>
</ul>
Available answers
The 'v-for' directive in Vue is used to render a list of items by iterating over an array. The code snippet shows how to loop through 'items' and render each 'item'.
Question 4/15
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answer was correct
🙁 Your
answer was incorrect
How do you bind an event listener to a button click in Vue?
<!-- Vue template -->
<button @click="handleClick">Click me</button>
Available answers
To bind an event listener for a button click in Vue, use the '@click' directive. It is shorthand for 'v-on:click'. In the code snippet, the click event triggers the 'handleClick' method.
Question 5/15
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answer was correct
🙁 Your
answer was incorrect
How can you specify a default value for a prop in Vue.js?
props: {
myProp: {
type: String,
default: 'Default Value'
}
}
Available answers
In Vue.js, you can specify a default value for a prop by including a 'default' field within the prop definition. The provided code snippet shows how to set 'Default Value' as the default for 'myProp'.
Question 6/15
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answer was correct
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answer was incorrect
How do you emit an event from a child component in Vue?
// In child component
this.$emit('myEvent', payload);
Available answers
To emit an event from a child component in Vue, use 'this.$emit()' inside the child component. This allows the parent component to listen for the event. In the code snippet, 'myEvent' is the event emitted with a 'payload'.
Question 7/15
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answer was correct
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answer was incorrect
When would you use a 'watcher' in Vue.js?
Available answers
A 'watcher' in Vue.js is used to perform actions in response to changes in a reactive data property. Watchers are useful for async operations or when data changes require more complex logic.
Question 8/15
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answer was correct
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answer was incorrect
What lifecycle hook would you use to fetch data when a component is created?
Available answers
The 'created' lifecycle hook is invoked when a Vue instance is created. It is a good place to fetch data because the component is fully initialized but not yet mounted.
Question 9/15
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answer was correct
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answer was incorrect
What is a scoped slot in Vue?
<template #default="slotProps">
<span>{{ slotProps.text }}</span>
</template>
Available answers
A scoped slot is a Vue slot that allows you to pass data from the child component back to the parent using the 'slot-scope' or newer shorthand syntax ('#'). The provided code snippet is an example where 'slotProps.text' is used.
Question 10/15
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answer was correct
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answer was incorrect
What does the 'props' option in a Vue component do?
Available answers
The 'props' option in a Vue component is used to declare properties that can be passed from the parent component. These props allow the component to be more flexible and dynamic.
Question 11/15
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answer was correct
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answer was incorrect
How do you pass a string prop to a child component in Vue.js?
// Parent component template
<child-component :message="'Hello'" />
Available answers
You use 'v-bind' (or simply the colon ':') to pass props to a child component in Vue.js. In the code snippet, ':' is a shorthand for 'v-bind' and is binding the string 'Hello' to the 'message' prop.
Question 12/15
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answer was correct
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answer was incorrect
Which directive is used for conditional rendering in Vue.js?
Available answers
The 'v-if' directive in Vue.js is used to conditionally render elements. It renders an element based on a boolean expression's truthiness.
Question 13/15
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answer was correct
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answer was incorrect
How would you register a component globally in Vue?
Vue.component('my-component', {
template: '<div>A custom component!</div>'
});
Available answers
To register a component globally in Vue, use 'Vue.component()', passing the component's name and its options. This makes the component available throughout the entire application.
Question 14/15
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answer was correct
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answer was incorrect
How do you configure a CSS class for an active state using Vue Router?
<router-link to="/home" active-class="active-link">Home</router-link>
Available answers
In Vue Router, you can configure a CSS class for an active link state using the 'active-class' attribute on a . The code snippet sets a class named 'active-link' for the active link to '/home'.
Question 15/15
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answer was correct
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answer was incorrect
How do you handle form submissions in Vue.js?
<!-- Vue template -->
<form @submit.prevent="submitForm">
<!-- form controls -->
</form>
Available answers
Form submissions in Vue.js can be handled by listening to the 'submit' event using '@submit'. Adding '.prevent' modifier prevents the default browser behavior, allowing you to handle the submission with the specified method.