Sample code for a graphql server

app.js

const { ApolloServer } = require('apollo-server');
const { generate } = require('shortid');

let data = [];

const typeDefs = `
  type Query {
    posts: [post]
    post(id: String!): post
  }

  type post {
    id: String
    title: String
    body: String
    status: String
  }

  type Mutation {
    addPost(title: String!, body: String!, status: String!): post
    deletePost(id: String!): post
    updatePost(id: String!, title: String, body: String, status: String): post
  }
`;

const resolvers = {
  Query: {
    // READ
    posts: () => data,
    post: (parent, args) => data.find(post => post.id === args.id)
  },
  Mutation: {
    // PUT
    addPost: (_, { title, body, status }) => {
      const newPost = {
        id: generate(),
        title,
        body,
        status
      };
      data = [...data, newPost];
      return newPost;
    },
    // DELETE
    deletePost: (_, { id }) => {
      const deletedPost = data.find(post => post.id === id);
      const newData = data.filter(post => post.id !== id);
      data = newData;
      return deletedPost;
    },
    // UPDATE
    updatePost: (_, { id, title, body, status }) => {
      const newData = data.map(post => {
        if (post.id === id) {
          post = {
            ...post,
            title: title || post.title,
            body: body || post.body,
            status: status || post.status
          };
          return post;
        }
        return post;
      });

      data = newData;

      return data.find(post => post.id === id);
    }
  }
};

const server = new ApolloServer({ typeDefs, resolvers });

server.listen().then(({ url }) => `server running at ${url}`).then(console.log);