React: Understand higher-order component with a simple example

This is my memo about React higher-order components with an example.

a higher-order component is a function that takes a component and returns a new component.

    const EnhancedComponent = higherOrderComponent(WrappedComponent);

HOC is useful when you want to reuse components logic.

This is the image of the example app.

This is the structure of files in src folder.

IncrementWrapper.jsx

    import { useState } from "react"
    const IncrementWrapper = (WrappedComponent, incrementValue)=>{
      const HOC = () => {
        const [value, setValue] = useState(0);
        const incrementHandler = () => {
          setValue(value + incrementValue)
        }
        return <WrappedComponent value={value} incrementHandler={incrementHandler} />
      }
      return HOC
    }

    export default IncrementWrapper;

IncrementBy1.jsx

    import IncrementWrapper from "../hoc/IncrementWrapper"
    const IncrementBy1 = ({value, incrementHandler}) => <>
      <button onClick={incrementHandler}>Increment By 1</button>
      <h1>{value}</h1>
    </>

    export default IncrementWrapper(IncrementBy1, 1)

IncrementBy10.jsx

    import IncrementWrapper from "../hoc/IncrementWrapper"

    const IncrementBy10 = ({value, incrementHandler}) => <>
      <button onClick={incrementHandler}>Increment By 10</button>
      <h1>{value}</h1>
    </>

    export default IncrementWrapper(IncrementBy10, 10)

IncrementBy100.jsx

    import IncrementWrapper from "../hoc/IncrementWrapper"

    const IncrementBy100 = ({value, incrementHandler}) => <>
      <button onClick={incrementHandler}>Increment By 100</button>
      <h1>{value}</h1>
    </>

    export default IncrementWrapper(IncrementBy100, 100)

The whole code is available here.

Thank you for reading :)

The original article is here

Blog

React: Understand higher-order component with a simple example

Yuko

IncrementWrapper.jsx

IncrementBy1.jsx

IncrementBy10.jsx

IncrementBy100.jsx

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