React Typescript and useCallback

Question

I'm trying to use Typescript and useCallback, but I'm having this error

Expected 0 arguments, but got 1

This is my code

const searchFriends = useCallback(() => (filterValue: string): void => {
    if (dataState.length <= INITIAL_FRIENDS_API_REQUEST) fetchAllFriends()
    const filterValueInsensitive = filterValue.toLowerCase()
    const filtered = dataState.filter((friend: Friends) => {
      return friend.displayName?.toLowerCase().includes(filterValueInsensitive)
    }) 
    setFriendsDisplayState(filtered)
  }, [dataState,fetchAllFriends]) 

  const handleChangeSearchInput = (
    e: React.ChangeEvent<HTMLInputElement>
  ): void => searchFriends(e.currentTarget.value) // ERROR here "Expected 0 arguments, but got 1"

Any idea how can I fix it?

score 7 · Accepted Answer · answered May 28 '20 at 09:24

You are using useCallback syntax like useMemo's. It doesn't need a currying function. The correct way to write it is like

const searchFriends = useCallback((filterValue: string): void => {
    if (dataState.length <= INITIAL_FRIENDS_API_REQUEST) fetchAllFriends()
    const filterValueInsensitive = filterValue.toLowerCase()
    const filtered = dataState.filter((friend: Friends) => {
      return friend.displayName?.toLowerCase().includes(filterValueInsensitive)
    }) 
    setFriendsDisplayState(filtered)
  }, [dataState,fetchAllFriends])

Happy to have helped :-) – Shubham Khatri May 29 '20 at 05:36 — Shubham Khatri, May 29 '20 at 05:36

React Typescript and useCallback

1 Answers1