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import { useQueryClient } from '@tanstack/react-query'

//creating queryClient object using useQueryClient hook
const queryClient = useQueryClient()

// Invalidate every query in the cache
queryClient.invalidateQueries()

// Invalidate every query with a key that starts with 'users'
queryClient.invalidateQueries({ queryKey: ['users'] })

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const query = useQuery({
      queryKey: ['users'],
      queryFn: getUsers,
      staleTime: 5000,
      cacheTime: 60000 
    })

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const AddUser = useMutation({
      mutationFn: ( user ) => {
        return fetch('https://jsonplaceholder.typicode.com/users',
        {
          method:'post',
          headers: {
             "Content-Type": "application/json",          
          },
          body:JSON.stringify( user )
        }).then( res =>  res.json() )

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const { isLoading, isError, data, error } = useQuery( { queryKey: ['todos'],   queryFn: getTodos });

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Map

Lesson

Slides - Map

Slides - Map Objects

Exercises - Map

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HoF Part 2 - each indices, each objects, filter

Lesson

Slides - Each Indices

Slides - Each Objects

Slides - Filter

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Introduction to Higher-Order Functions

Lessons

Slides 1

Slides 2

Two Forms of Functions