React Hooks are live. Here is your introduction

Okay, but what are hooks really?

Great! How do I do that?

First, Update your React and React DOM dependency in your project. Hooks are freshly released on React 16.8.0 today!

Now let’s take a look on the useState hook. Here is the demo:

We need to have a simple class component with state for comparison. The easiest example I can imagine is of an input form:

Now let’s rewrite it using useState hook. We'll import it from react package so we don't have to write React.useState all the time.

Now change our NameForm into a function component

useState hook takes one argument, which is the initial state, and it returns two values: the current state and a function that can be used to update the state. You can replace the state initialization in the constructor:

into this:

So this means we have a state named value and we can update it by calling on setValue function. Let’s use it on our render method:

Onchange props no longer call a handleChange method, instead we have an arrow function that will call setValue function, which update our state. Oh, and unlike this.setState in the class component, updating a state variable using hooks always replace it instead of merging it.

Then call on useState as many times as you need.

And that’s it with useState hook, really!

Oh, it’s pretty easy!

Got you covered here:

The important thing to remember is that hooks don’t work in a class component. They are made for function components.

The useState hook enables function components to access React’s internal state and update it. The state can be any data type: string, number, boolean, array, or object. useState accept one argument: the initial data, and it returns an array of two values: the current state value and the function/ method that can be used to update the state.

There are more than just useState hook, but let’s cover each hook in their own single post.

Until next time!

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