Transform your daily workflows and Convert Functional Application

Aug 6th, 2022
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How to Convert Functional Application

5 out of 5
70 votes

okay so in this video uh were going to take a look at a react app that was made with class components and change it uh so that it has functional components and the app that im using for this is um is from uh brad traversis to do uh to-do list if you uh go to youtube and you just um you type in react and practice to do uh list you should get um his its a 2019 app i i i think its pretty um pretty straightforward doesnt try to do uh too many fancy things and its good uh good clean code to learn from so um i chose that um but the first that you can look at the folder right here um we have a header.js weve about.js and had to do two item to dos in app.js were going to start by converting this uh this app.js to functional components um and so the first thing that we need to do for that is to notice that the app itself goes you can see the yellow line it goes from there all the way down to there right and then after that this export default um that uh excuse me that sends out the a

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Create a Class Component When creating a React component, the components name must start with an upper case letter. The component has to include the extends React.Component statement, this statement creates an inheritance to React.Component, and gives your component access to React.Components functions.
Quick steps to convert to a function component Change the class to a function. Remove the render method. Convert all methods to functions. Remove references to this. Remove constructor. Remove event handler bindings. Replace this.setState. useEffect for state update side effects.
Quick steps to convert to a function component Change the class to a function. Remove the render method. Convert all methods to functions. Remove references to this. Remove constructor. Remove event handler bindings. Replace this.setState. useEffect for state update side effects.
Methods like componentWillMount, componentDidUpdate, etc., while functional component doesnt because these are simple JS functions that accept props and return its elements. In contrast, the class component has a render method that extends its Component. However, it had changed when Hooks came to the introduction.
If we want to convert a function component to a class component then we need to make the following major changes. Change the function to a class. Add the render method. Convert all function to a method. Add Constructor. Replace hooks with lifecycle methods.
10 Steps to Convert React Class Component to React Functional Component with Hooks Set initial state with useState(). Set a number const [count, setCount] = useState(0) Set a string const [username, setUsername] = useState() Set true/false const [isOpen, setIsOpen] = useState(false)
Converting Class Component to Functional Component Glean seamlesly automates convertion of class components to functional component, while take care of all the complexity: Converts setState calls to useState. Converts componentDidMount and componentWillUnmount to useEffect. Converts class properties to useRef.
10 Steps to Convert React Class Component to React Functional Component with Hooks Set initial state with useState(). Set a number const [count, setCount] = useState(0) Set a string const [username, setUsername] = useState() Set true/false const [isOpen, setIsOpen] = useState(false)

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