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Mastering React Hooks by Simplifying Functional Components


Picture of the author (Gustavo Maltez)

Gustavo Maltez

May 25, 2023
3 min read

What are React hooks?

React hooks are a powerful feature introduced in React 16.8 that allows us to use state and other React features in functional components. In this blog post, we will explore some commonly used React hooks and see how they can simplify our code.

useState

The useState hook is used to manage state in a functional component. Here's an example of how to use useState:

import React, { useState } from 'react';

const Counter = () => {
  const [count, setCount] = useState(0);

  const increment = () => {
    setCount(count + 1);
  };

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={increment}>Increment</button>
    </div>
  );
};

export default Counter;

In the above example, we are using the useState hook to create a state variable called count and a function called setCount to update the state. The useState hook takes an initial value as an argument and returns an array with the state variable and the function to update the state.

useEffect

The useEffect hook is used to perform side effects in a functional component. Here's an example of how to use useEffect:

import React, { useState, useEffect } from 'react';

const Counter = () => {
  const [count, setCount] = useState(0);

  useEffect(() => {
    document.title = `Count: ${count}`;
  });

  const increment = () => {
    setCount(count + 1);
  };

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={increment}>Increment</button>
    </div>
  );
};

export default Counter;

In the above example, we are using the useEffect hook to update the document title whenever the count state variable changes. The useEffect hook takes a function as an argument and executes it after every render. If you want to execute the function only once, you can pass an empty array as the second argument to the useEffect hook.

useContext

The useContext hook is used to access the context in a functional component. Here's an example of how to use useContext:

import React, { useContext } from 'react';

const ThemeContext = React.createContext('light');

const ThemeProvider = ({ children }) => {
  return (
    <ThemeContext.Provider value='dark'>
      {children}
    </ThemeContext.Provider>
  );
};

const Button = () => {
  const theme = useContext(ThemeContext);

  return (
    <button style={{ background: theme }}>
      Click me
    </button>
  );
};

const App = () => {
  return (
    <ThemeProvider>
      <Button />
    </ThemeProvider>
  );
};

export default App;

In the above example, we are using the useContext hook to access the context value in the Button component. The useContext hook takes a context object as an argument and returns the current context value.


Comments

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Gustavo Maltez

7 months ago

I really enjoyed reading this post. The examples are clear and concise.

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Gustavo Maltez

7 months ago

The part about custom hooks is a game-changer. Thanks for sharing!