React

UseCallback, same as useMemo hook, is useful in situation, when you want to improve performance of your app. Thanks to it, you can avoid useless renders, so app can works faster.

UseMemo hook returns memoized value. That’s why you can use it to optimize performance of your app. If you have large calculations to get value that you need, you can do it only once and use useMemo hook to remember this value.

UseRef hook can be used in two ways. First, it allows to directly access to DOM element, so we can manipulate it. Second, it can keep any mutable value in its .current property, that is not change between renders.

UseEffect hook runs after first render and after every other completed render (but we can change that, so it can runs after first render and only when certain values have changed). We may put in it piece of code, that runs after component render, so we can change state or manipulate DOM tree before it […]

UseContext hook provides a way to pass data through the component tree without having to pass props down manually at every level. It helps maintaining cleaner code. In other words – it provides a way to share values between components without having to explicitly pass a prop through every level of the tree.

UseReducer is an alternative to useState. It works better when you have complex state logic that involves multiple sub-values (e.g. if your state is multidimensional object) or when the next state depends on the previous one. UseReducer hook accepts a reducer of type (state, action) => newState, and returns the current state paired with a dispatch method:

Hooks are a new functionality of React, thanks to which we can “hook into” React features, which makes writing applications easier. First hook that I want to show you is called useState and it is a hook that allows you to use state in a functional component (before hooks you could not use states in […]