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deletePost(parent,args,{db,pubsub},info){
       const isPostExists = db.posts.findIndex((post)=> post.id === args.id)
        if(isPostExists === -1){
            throw new Error('Post does not exist!')
        }
        //splice will return the index of the removed items from the array object
        const [post] = db.posts.splice(isPostExists, 1)

        db.comments = db.comments.filter((comment) => comment.post !== args.id)

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subscription{
  post{
    mutation
    data{
      id
      title
      body
      author{
        id
        name

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createPost(parent,args,ctx,info){
        const userExists = ctx.users.some((user)=> user.id === args.author)

        if(!userExists){
            throw new Error('User does not exist!')
        }

        const post = {
            id: uuidv4(),
            ...args

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const server  = new GraphQLServer({
    typeDefs,
    resolvers,
    context:{
        pubsub
    }
})

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const resolvers = {
  Subscriptions:{
          post:{
              subscribe(parent, args, ctx, info){
                  return ctx.pubsub.asyncIterator('post')
              }
          }
      }
}

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import { PubSub } from 'graphql-yoga';
const pubsub = new PubSub()

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type PostSubscriptionPayload {
    mutation: String!
    data: Post!
}

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type Subscription {
    post: PostSubscriptionPayload!
}

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updateUser(parent, args, ctx, info){
        const user = users.find((user) => user.id === args.id)
        if(!user){
            throw new Error('User does not exist!')
        }

        if(typeof args.email === 'string'){
            const isEmailExists = db.users.some((user) => user.email === args.email)
            if(isEmailExists){
                throw new Error('Email already Taken')

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type Mutation{
        createNewUser(name: String!, email: String!, age: Int): User!
        deleteUser(id: ID!): User!
        updateUser(id: ID!, name: String, email: String, age: Int): User!
    }