Vue.js and GraphQL Quiz

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Question 1/15

How do you declare a mutation in a Vue component using Apollo Client?
<template> <button @click="addBook">Add Book</button> </template> <script> import { gql } from 'apollo-boost'; export default { methods: { addBook() { this.$apollo.mutate({ mutation: gql` mutation AddBook($title: String, $author: String) { addBook(title: $title, author: $author) { id title author } } `, variables: { title: "New Book", author: "Author Name" } }).then(result => { console.log(result); }); } } } </script>

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Question 2/15

How can you automatically refetch a query in Apollo Client used in Vue.js based on some condition?
<script> export default { data() { return { refetchTimer: null }; }, apollo: { book: { query: BOOK_QUERY, variables() { return { isActive: true }; }, refetch() { return this.refetchTimer; } } }, mounted() { this.refetchTimer = setInterval(() => { this.$apollo.queries.book.refetch(); }, 30000); } } </script>

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Question 3/15

How does Vue Apollo help in handling GraphQL queries within methods or lifecycle hooks?
methods: { fetchBook() { this.$apollo.query({ query: gql` query { book(id: "1") { title } } ` }).then(result => { console.log(result); }); } }

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Question 4/15

Which of the following is a correct use of VueApollo in a main.js file?
import Vue from 'vue'; import VueApollo from 'vue-apollo'; import ApolloClient from 'apollo-boost'; const apolloClient = new ApolloClient({ uri: 'http://localhost:4000/graphql', }); Vue.use(VueApollo); const apolloProvider = new VueApollo({ defaultClient: apolloClient }); new Vue({ apolloProvider, render: h => h(App), }).$mount('#app');

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Question 5/15

What is an advantage of using GraphQL with Vue.js over REST?

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Question 6/15

What is the GraphQL type created by Apollo Client to help identify and manage individual items in the cache?

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Question 7/15

What is the purpose of fragments in GraphQL when used in Vue.js applications?

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Question 8/15

How can you optimize performance with Apollo Client in a Vue.js application?

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Question 9/15

What is the difference between `fetchPolicy: "network-only"` and `fetchPolicy: "cache-and-network"` in Apollo Client?

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Question 10/15

What role does the useQuery hook play in Apollo Client when used with Vue Composition API?

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Question 11/15

What is the purpose of Apollo Client in a Vue.js application?

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Question 12/15

What is the recommended way to handle pagination with Apollo Client in a Vue.js application?

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Question 13/15

Which of the following is a correct way to set up a GraphQL query using Apollo in a Vue component?
<template> <div>{{ bookData }}</div> </template> <script> import { gql } from 'apollo-boost'; export default { data() { return { bookData: null }; }, apollo: { bookData: gql` query { book { title author } } ` } } </script>

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Question 14/15

How do you perform a query in a Vue.js with Apollo Client to dynamically fetch data based on a parameter?
<template> <div>{{ book.title }}</div> </template> <script> import { gql } from 'apollo-boost'; export default { data() { return { book: {} }; }, apollo: { book: { query: gql` query getBook($id: ID!) { book(id: $id) { title } } `, variables() { return { id: this.$route.params.id } }, } } } </script>

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Question 15/15

In a Vue component with Apollo Client, what does the apolloLoadingKey option default to?

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Your Answers

Question 1/15
😊 Your answer was correct 🙁 Your answer was incorrect
How do you declare a mutation in a Vue component using Apollo Client?
<template> <button @click="addBook">Add Book</button> </template> <script> import { gql } from 'apollo-boost'; export default { methods: { addBook() { this.$apollo.mutate({ mutation: gql` mutation AddBook($title: String, $author: String) { addBook(title: $title, author: $author) { id title author } } `, variables: { title: "New Book", author: "Author Name" } }).then(result => { console.log(result); }); } } } </script>

Available answers

Mutations in Vue components are declared using the `$apollo.mutate` function, allowing updates to be performed and handled within the component methods.
Question 2/15
😊 Your answer was correct 🙁 Your answer was incorrect
How can you automatically refetch a query in Apollo Client used in Vue.js based on some condition?
<script> export default { data() { return { refetchTimer: null }; }, apollo: { book: { query: BOOK_QUERY, variables() { return { isActive: true }; }, refetch() { return this.refetchTimer; } } }, mounted() { this.refetchTimer = setInterval(() => { this.$apollo.queries.book.refetch(); }, 30000); } } </script>

Available answers

Queries in Apollo Client can be automatically refetched based on conditions or intervals by utilizing the `refetch` method within the Apollo query options.
Question 3/15
😊 Your answer was correct 🙁 Your answer was incorrect
How does Vue Apollo help in handling GraphQL queries within methods or lifecycle hooks?
methods: { fetchBook() { this.$apollo.query({ query: gql` query { book(id: "1") { title } } ` }).then(result => { console.log(result); }); } }

Available answers

Vue Apollo adds a `$apollo` object to Vue components, allowing developers to perform GraphQL queries and handle results within methods or lifecycle hooks directly.
Question 4/15
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Which of the following is a correct use of <code>VueApollo</code> in a <code>main.js</code> file?
import Vue from 'vue'; import VueApollo from 'vue-apollo'; import ApolloClient from 'apollo-boost'; const apolloClient = new ApolloClient({ uri: 'http://localhost:4000/graphql', }); Vue.use(VueApollo); const apolloProvider = new VueApollo({ defaultClient: apolloClient }); new Vue({ apolloProvider, render: h => h(App), }).$mount('#app');

Available answers

`VueApollo` is used as a Vue plugin to integrate Apollo Client into Vue applications, allowing the use of GraphQL with Vue components.
Question 5/15
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What is an advantage of using GraphQL with Vue.js over REST?

Available answers

The primary advantage of using GraphQL is that it allows clients to specify exactly what data they need, reducing over-fetching and under-fetching data.
Question 6/15
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What is the GraphQL type created by Apollo Client to help identify and manage individual items in the cache?

Available answers

Apollo Client uses the `__typename` field along with object IDs to uniquely identify objects, helping manage caching and updating queries.
Question 7/15
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What is the purpose of fragments in GraphQL when used in Vue.js applications?

Available answers

Fragments allow you to define a set of fields once and include it in multiple queries or mutations, promoting reusability and consistency across your GraphQL operations.
Question 8/15
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How can you optimize performance with Apollo Client in a Vue.js application?

Available answers

Optimizing performance with Apollo Client involves using effective caching strategies and smartly refetching queries only when necessary to minimize unnecessary network requests.
Question 9/15
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What is the difference between `fetchPolicy: "network-only"` and `fetchPolicy: "cache-and-network"` in Apollo Client?

Available answers

`network-only` fetches data exclusively from the network and temporarily disregards the cache, whereas `cache-and-network` first attempts to return a cached version while subsequently updating it by re-fetching from the network.
Question 10/15
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What role does the useQuery hook play in Apollo Client when used with Vue Composition API?

Available answers

When using the Vue Composition API with Apollo Client, `useQuery` is used to execute and manage queries effectively within the composition functions.
Question 11/15
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What is the purpose of Apollo Client in a Vue.js application?

Available answers

Apollo Client is used to manage and cache GraphQL queries and results, making it easy to integrate GraphQL into a Vue.js application.
Question 12/15
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What is the recommended way to handle pagination with Apollo Client in a Vue.js application?

Available answers

The recommended approach is to use GraphQL's cursor-based pagination along with Apollo's `fetchMore` to load additional pages of data efficiently.
Question 13/15
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Which of the following is a correct way to set up a GraphQL query using Apollo in a Vue component?
<template> <div>{{ bookData }}</div> </template> <script> import { gql } from 'apollo-boost'; export default { data() { return { bookData: null }; }, apollo: { bookData: gql` query { book { title author } } ` } } </script>

Available answers

In a Vue component, GraphQL queries can be defined inside the `apollo` option, allowing Apollo Client to automatically fetch data and bind it to component properties.
Question 14/15
😊 Your answer was correct 🙁 Your answer was incorrect
How do you perform a query in a Vue.js with Apollo Client to dynamically fetch data based on a parameter?
<template> <div>{{ book.title }}</div> </template> <script> import { gql } from 'apollo-boost'; export default { data() { return { book: {} }; }, apollo: { book: { query: gql` query getBook($id: ID!) { book(id: $id) { title } } `, variables() { return { id: this.$route.params.id } }, } } } </script>

Available answers

Apollo Client in Vue.js allows you to define queries with dynamic parameters by using the `variables` option, which can be set based on component data or props.
Question 15/15
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In a Vue component with Apollo Client, what does the <code>apolloLoadingKey</code> option default to?

Available answers

In a Vue component using Apollo Client, `apolloLoadingKey` defaults to `loading`, which can be used in data bindings and computed properties to display Loading UI.