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Vue.js and GraphQL Quiz

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Question 1/15

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>

Select your answer

Using Vuex to store the query response

Specifying the query inside the apollo option in the component

Using Apollo's provider inside the data function

Embedding the query directly into the template

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>

Select your answer

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

By setting a `refetchFromServer` directive

Through the Vue router transition hooks

Automatically with every method call

Question 3/15

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

Using the global store to manage these states

By forcing a network response for each query

Assigning fixed values to check for these states

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

Question 4/15

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

By using a GraphQL schema function and passing the parameter directly

By embedding the parameter directly in the GraphQL schema

By passing parameters through the Vue router

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

Question 5/15

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 directly assigned as a Vue component.

VueApollo is used to handle state management.

VueApollo replaces the Vue router.

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

Question 6/15

What is meant by optimistic UI in the context of Vue.js and Apollo Client?

Select your answer

Executing queries automatically on component creation

Predictively updating the UI in anticipation of a successful mutation

Always showing a success message regardless of the query result

Falling back to default data if queries fail

Question 7/15

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

Select your answer

To automatically optimize database schemas

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

To split Vue components into smaller reusable parts

To repeat queries for multiple components in a concise manner

Question 8/15

How does the cache-first fetch policy work with Apollo Client in Vue?

Select your answer

It ensures that queries are always cached, even without results.

It retries failed requests indefinitely until they succeed.

It fetches data from the cache if available and falls back to network only if the cache is unavailable.

It always fetches the latest data from the network and ignores the cache.

Question 9/15

What is the main use of gql in Vue applications with Apollo Client?

Select your answer

To connect Vue with RESTful services

To transform Vue components to GraphQL APIs

To declare and parse GraphQL queries in JavaScript

To validate GraphQL schema on the server

Question 10/15

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

keepAlive

stayConnected

persistentSubscription

Question 11/15

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

Select your answer

To handle RESTful API requests

To compile Vue single-file components

To manage and cache GraphQL queries

To provide state management like Vuex

Question 12/15

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

Select your answer

apollo-vuex-sync

vuex-apollo-query

vuex-cache-manager

apollo-cache-persist

Question 13/15

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

Select your answer

It is used to initiate GraphQL subscriptions

It compiles Vue templates

It acts as a replacement for the Vuex store

It manages GraphQL queries within the new Composition API

Question 14/15

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 using a custom directive to catch errors

Through the Vuex state management system

By logging all errors to the console directly from the component

Question 15/15

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

Select your answer

loadingApolloState

isFetching

fetchingData

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Using Vuex to store the query response

Specifying the query inside the apollo option in the component

Using Apollo's provider inside the data function

Embedding the query directly into the template

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 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

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

By setting a `refetchFromServer` directive

Through the Vue router transition hooks

Automatically with every method call

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

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

Using the global store to manage these states

By forcing a network response for each query

Assigning fixed values to check for these states

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

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 4/15

😊 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

By using a GraphQL schema function and passing the parameter directly

By embedding the parameter directly in the GraphQL schema

By passing parameters through the Vue router

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

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 5/15

😊 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 directly assigned as a Vue component.

VueApollo is used to handle state management.

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 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is meant by optimistic UI in the context of Vue.js and Apollo Client?

Available answers

Executing queries automatically on component creation

Predictively updating the UI in anticipation of a successful mutation

Always showing a success message regardless of the query result

Falling back to default data if queries fail

Optimistic UI allows an application to update the UI immediately after a mutation without waiting for the server response, providing a smoother user experience.

Question 7/15

😊 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 automatically optimize database schemas

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

To split Vue components into smaller reusable parts

To repeat queries for multiple components in a concise manner

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

😊 Your answer was correct 🙁 Your answer was incorrect

How does the <code>cache-first</code> fetch policy work with Apollo Client in Vue?

Available answers

It ensures that queries are always cached, even without results.

It retries failed requests indefinitely until they succeed.

It fetches data from the cache if available and falls back to network only if the cache is unavailable.

It always fetches the latest data from the network and ignores the cache.

The `cache-first` fetch policy uses cached data if it exists, resorting to a network request only if the data is not available in the cache, optimizing for performance.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main use of <code>gql</code> in Vue applications with Apollo Client?

Available answers

To connect Vue with RESTful services

To transform Vue components to GraphQL APIs

To declare and parse GraphQL queries in JavaScript

To validate GraphQL schema on the server

`gql` is a template literal tag used to designate and parse GraphQL queries and mutations within JavaScript in Vue applications using Apollo.

Question 10/15

😊 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

keepAlive

stayConnected

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 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

To handle RESTful API requests

To compile Vue single-file components

To manage and cache GraphQL queries

To provide state management like Vuex

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

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

apollo-vuex-sync

vuex-apollo-query

vuex-cache-manager

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 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

It is used to initiate GraphQL subscriptions

It compiles Vue templates

It acts as a replacement for the Vuex store

It manages GraphQL queries within the new Composition API

When using the Vue Composition API with Apollo Client, `useQuery` is used to execute and manage queries effectively within the composition functions.

Question 14/15

😊 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 using a custom directive to catch errors

Through the Vuex state management system

By logging all errors to the console directly from the component

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 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

loadingApolloState

isFetching

fetchingData

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.