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Vue.js and GraphQL Quiz

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Question 1/15

Which Vuex plugin can integrate with Apollo to manage local cache state?

Select your answer

vuex-apollo-query

vuex-cache-manager

apollo-vuex-sync

apollo-cache-persist

Question 2/15

What is the purpose of the fetchMore function in Apollo Client used with Vue.js?

Select your answer

To execute a brand new query and replace the existing data

To add additional data to the current query result without a new query

To perform mutations similar to REST APIs

To merge multiple queries into one

Question 3/15

How do you handle errors globally in a Vue.js application using Apollo Client?

 import { ApolloLink } from 'apollo-link'; import { onError } from 'apollo-link-error'; const errorLink = onError(({ graphQLErrors, networkError }) => { if (graphQLErrors) { graphQLErrors.forEach(({ message, locations, path }) => { console.log(`[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`); }); } if (networkError) { console.log(`[Network error]: ${networkError}`); } });

Select your answer

By using the onError() link from Apollo Client to intercept and handle errors

By logging all errors to the console directly from the component

By using a custom directive to catch errors

Through the Vuex state management system

Question 4/15

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

Select your answer

Using the built-in pagination plugin for Vue

Switching to REST only for paginated data

Combining GraphQL cursor-based pagination with `fetchMore`

By manually changing the DOM to reflect pagination

Question 5/15

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

Select your answer

GraphQL can only fetch data.

GraphQL allows clients to request only the data they need.

GraphQL queries are mandatory, unlike optional REST endpoints.

GraphQL automatically updates all state management in Vue.

Question 6/15

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');

Select your answer

VueApollo is used to handle state management.

VueApollo is directly assigned as a Vue component.

VueApollo replaces the Vue router.

VueApollo is used as a plugin to provide Apollo Client to the Vue application.

Question 7/15

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>

Select your answer

Using the Apollo client to dynamically adjust the `variables` option of the query

By embedding the parameter directly in the GraphQL schema

By passing parameters through the Vue router

By using a GraphQL schema function and passing the parameter directly

Question 8/15

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>

Select your answer

By placing a GraphQL string directly in the template

Through Vuex store actions

Using the $apollo.mutate function with a mutation key

Within Vue CSS bindings

Question 9/15

In a Vue component setup, how can you distinguish between loading and error states when executing GraphQL operations?

<template> <div v-if="loading">Loading...</div> <div v-if="error">An error occurred: {{ error.message }}</div> <div v-else>{{ data }}</div> </template>

Select your answer

Assigning fixed values to check for these states

By forcing a network response for each query

Through the `loading` and `error` properties provided by the Apollo Client query context

Using the global store to manage these states

Question 10/15

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

Select your answer

To split Vue components into smaller reusable parts

To repeat queries for multiple components in a concise manner

To re-use sets of fields across multiple GraphQL queries and mutations

To automatically optimize database schemas

Question 11/15

Which command is used to install Apollo Client for a Vue.js application?

Select your answer

npm install vue-resource graphql

npm install vuex apollo-client graphql

npm install vue-apollo apollo-client graphql

npm install vue-router apollo-client graphql

Question 12/15

What Vue Apollo option allows you to keep a subscription consistently active, even when the component is not in the DOM?

Select your answer

reconnectBehavior

stayConnected

keepAlive

persistentSubscription

Question 13/15

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>

Select your answer

Through the Vue router transition hooks

Automatically with every method call

By setting a `refetchFromServer` directive

By using setInterval or conditions in the refetch option of Apollo query

Question 14/15

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

Select your answer

Avoid using any fragments in GraphQL queries

Disable caching to get fresh data every time

Only use REST endpoints for heavy data loads

Use proper caching strategies and refetch queries intelligently

Question 15/15

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

Select your answer

Both policies fetch data only from the cache but `cache-and-network` will retry failed requests.

They are identical in functionality, providing the same results.

`network-only` will cache only error responses, whereas `cache-and-network` caches only success responses.

`network-only` ignores the cache and always fetches data, while `cache-and-network` attempts a cached response first and updates it with a network response.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which Vuex plugin can integrate with Apollo to manage local cache state?

Available answers

vuex-apollo-query

vuex-cache-manager

apollo-vuex-sync

apollo-cache-persist

`apollo-cache-persist` is a Vuex plugin that can be used alongside Apollo Client to persist and rehydrate the cache state.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the <code>fetchMore</code> function in Apollo Client used with Vue.js?

Available answers

To execute a brand new query and replace the existing data

To add additional data to the current query result without a new query

To perform mutations similar to REST APIs

To merge multiple queries into one

The `fetchMore` function in Apollo Client allows for paginating or appending additional data fetched by the current query, useful for loading more items without replacing existing results.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you handle errors globally in a Vue.js application using Apollo Client?

 import { ApolloLink } from 'apollo-link'; import { onError } from 'apollo-link-error'; const errorLink = onError(({ graphQLErrors, networkError }) => { if (graphQLErrors) { graphQLErrors.forEach(({ message, locations, path }) => { console.log(`[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`); }); } if (networkError) { console.log(`[Network error]: ${networkError}`); } });

Available answers

By using the <code>onError()</code> link from Apollo Client to intercept and handle errors

By logging all errors to the console directly from the component

By using a custom directive to catch errors

Through the Vuex state management system

Errors in Apollo Client can be handled by utilizing the `onError` link, which allows you to globally capture and manage errors from GraphQL operations.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Using the built-in pagination plugin for Vue

Switching to REST only for paginated data

Combining GraphQL cursor-based pagination with `fetchMore`

By manually changing the DOM to reflect pagination

The recommended approach is to use GraphQL's cursor-based pagination along with Apollo's `fetchMore` to load additional pages of data efficiently.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

GraphQL can only fetch data.

GraphQL allows clients to request only the data they need.

GraphQL queries are mandatory, unlike optional REST endpoints.

GraphQL automatically updates all state management in Vue.

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

😊 Your answer was correct 🙁 Your answer was incorrect

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 to handle state management.

VueApollo is directly assigned as a Vue component.

VueApollo replaces the Vue router.

VueApollo is used as a plugin to provide Apollo Client to the Vue application.

`VueApollo` is used as a Vue plugin to integrate Apollo Client into Vue applications, allowing the use of GraphQL with Vue components.

Question 7/15

😊 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

Using the Apollo client to dynamically adjust the `variables` option of the query

By embedding the parameter directly in the GraphQL schema

By passing parameters through the Vue router

By using a GraphQL schema function and passing the parameter directly

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 8/15

😊 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

By placing a GraphQL string directly in the template

Through Vuex store actions

Using the $apollo.mutate function with a mutation key

Within Vue CSS bindings

Mutations in Vue components are declared using the `$apollo.mutate` function, allowing updates to be performed and handled within the component methods.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

In a Vue component setup, how can you distinguish between loading and error states when executing GraphQL operations?

<template> <div v-if="loading">Loading...</div> <div v-if="error">An error occurred: {{ error.message }}</div> <div v-else>{{ data }}</div> </template>

Available answers

Assigning fixed values to check for these states

By forcing a network response for each query

Through the `loading` and `error` properties provided by the Apollo Client query context

Using the global store to manage these states

Apollo Client exposes `loading` and `error` properties for queries, which you can use in Vue components to render UI conditionally based on the current state of the GraphQL operation.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

To split Vue components into smaller reusable parts

To repeat queries for multiple components in a concise manner

To re-use sets of fields across multiple GraphQL queries and mutations

To automatically optimize database schemas

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 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which command is used to install Apollo Client for a Vue.js application?

Available answers

npm install vue-resource graphql

npm install vuex apollo-client graphql

npm install vue-apollo apollo-client graphql

npm install vue-router apollo-client graphql

The command `npm install vue-apollo apollo-client graphql` installs Apollo Client and its dependencies for use in a Vue.js application.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

What Vue Apollo option allows you to keep a subscription consistently active, even when the component is not in the DOM?

Available answers

reconnectBehavior

stayConnected

keepAlive

persistentSubscription

The `keepAlive` option in Vue Apollo ensures that a subscription stays active, even when the Vue component managing it is temporarily removed from the DOM.

Question 13/15

😊 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

Through the Vue router transition hooks

Automatically with every method call

By setting a `refetchFromServer` directive

By using setInterval or conditions in the refetch option of Apollo query

Queries in Apollo Client can be automatically refetched based on conditions or intervals by utilizing the `refetch` method within the Apollo query options.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Avoid using any fragments in GraphQL queries

Disable caching to get fresh data every time

Only use REST endpoints for heavy data loads

Use proper caching strategies and refetch queries intelligently

Optimizing performance with Apollo Client involves using effective caching strategies and smartly refetching queries only when necessary to minimize unnecessary network requests.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Both policies fetch data only from the cache but `cache-and-network` will retry failed requests.

They are identical in functionality, providing the same results.

`network-only` will cache only error responses, whereas `cache-and-network` caches only success responses.

`network-only` ignores the cache and always fetches data, while `cache-and-network` attempts a cached response first and updates it with a network response.

`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.