Usually used to directly access a DOM element. We can make changes like we do in Valillajs. We can also be used to store a mutable value that does not cause rework when Updated. that is, changes made to the current value of UseRef will not re-render. UseState triggers the component to be rendered again...
When it comes to using effects hook in React it allows us to perform side effect in function component. UseEffect lets you perform data fetching, updating the DOM directly, timers, and side effects such as state or variable changes in your components. useEffect is one of the most used hooks in react applications.
useState is a React Hook that allows us to access state in function components. State refers to the data or properties that should be tracked in our project. useState allows us to use React's state property without writing a class. It has been included in the react library since v16.8 (in 2019). Before it was included in the react library...
We have two keywords Async and Await. We use async in front of a function declaration or function expression. The async keyword is used to define a particular function as an asynchronous function. When we put the Async keyword at the beginning of our function, we get a promise.
Promise is easier to write and implement than callbacks. A promise is simply an object that represents the completion or failure of a process. It's usually something that takes time. When we use a library like Axios we return a promise and when we request data from api this process may take time and this value may never come back...
The concept of scope is quite easy and very important topic in javascript. So let's delve deeper into this issue. Scope is the ability of our other code pieces to access this value or not, depending on where the variable defined is located. In other words, we can access variables, objects, functions according to their scope...