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HomeSoftware EngineeringHow To Reuse React Parts | by Sabesan Sathananthan | Codezillas

How To Reuse React Parts | by Sabesan Sathananthan | Codezillas


After Mixin, HOC high-order components take on the heavy responsibility and become the recommended solution for logical reuse between components. High-order components reveal a high-order atmosphere from their names. In fact, this concept should be derived from high-order functions of JavaScript. The high-order function is a function that accepts a function as input or output. It can be thought that currying is a higher-order function. The definition of higher-order components is also given in the React document. Higher-order components receive components and return new components. function. The specific meaning is: High-order components can be seen as an implementation of React decoration pattern. High-order components are a function, and the function accepts a component as a parameter and returns a new component. It will return an enhanced React components. High-order components can make our code more reusable, logical and abstract, can hijack the render method, and can also control propsand state.

  • Ref transfer problem: Ref is cut off. The transfer problem of Ref is quite annoying under the layers of packaging. The function Ref can alleviate part of it (allowing HOC to learn about node creation and destruction), so the React.forwardRef API API was introduced later.
  • WrapperHell: HOC is flooded, and WrapperHell appears (there is no problem that cannot be solved by one layer, if there is, then two layers). Multi-layer abstraction also increases complexity and cost of understanding. This is the most critical defect. In HOC mode There is no good solution.

Example

Specifically, a high-order component is a function whose parameter is a component and the return value is a new component. A component converts props into a UI but a high-order component converts a component into another component. HOC is very common in React third-party libraries, such as Redux’s connect and Relay’s createFragmentContainer.

  • Reverse inheritance Inheritance Inversion.

Property Agent

For example, we can add a stored id attribute value to the incoming component. We can add a props to this component through high-order components. Of course, we can also operate on the props in the WrappedComponent component in JSX. Note that it is not to manipulate the incoming WrappedComponent class, we should not directly modify the incoming component, but can operate on it in the process of combination.

Reverse inheritance

Reverse inheritance means that the returned component inherits the previous component. In reverse inheritance, we can do a lot of operations, modify state, props and even flip the Element Tree. There is an important point in the reverse inheritance that reverse inheritance cannot ensure that the complete sub-component tree is parsed. That means if the parsed element tree contains components (function type or Class type), the sub-components of the component can no longer be manipulated.

note

Don’t change the original components

const NavbarWithRouter = withRouter(Navbar);
const CommentWithRelay = Relay.createContainer(Comment, config);
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