Understanding higher-order components

  • Why use HOC: Promote reuse of logic across React components.
  • How to use HOC: The core structure of a HOC is a function that takes a component and returns a new component.
  • HOC are pure functions with no side-effects because the component passed in, is wrapped in a new component.
  • The HOC looks like this: – – State now has a property to inject data from the API fetch into the wrapped component via the prop.
  • React Redux connect has a different function signature of a function returning a function which accepts one argument (ie, ‘component’) to create a HOC.

Understand why and how to use higher-order components with React JS

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React — Composing Higher-Order Components (HOCs) – Casey Morris – Medium

  • Data is passed down to the wrapped component.LoggerEasily log all prop changes (on render) for a given component, helpful for quick debugging purposes.PropsSometimes you need to inject props into a component, this is especially useful when using a branch HOC and only want a single branch to receive specific props.TimeoutsAdding…
  • This HOC will also spread the current data item as props into the supplied component.HOCsNow that we’ve gone over a few use cases, lets look at some simple implementations before we get into any complex chaining.hasPropsTakes a single parameter, injectedProps and returns a wrapped component with the supplied injectedProps .
  • Useful when you need to inject props to a single component within the branch hoc, as the props supplied are injected into both passing and failing components.Use:Use with branch HOC:hasLoggerTakes a single parameter, prefix which prefixes the logged message, defaults to an empty string.
  • Injects data, hasError, error, useDefault, loading, and loadingMessage as props to be used in the wrapped no parameters and returns a wrapped component with injected props addTimeout and clearTimeouts.
  • This page includes a MockPostContainer which extends the Post component with a logger, mock data, loader, error, default, and list.Posts, Todos, Comments, and Users PagesAll of these pages consume real API endpoints from They each extend a single component (Post, Todo, Comment, User) with the isContainer and isList HOCs.Wrapping UpI hope…

To put it simply, a higher-order component is a function, that takes a component and returns a new component. I like to think of them as parameterized components. Many times I find myself creating…
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Higher Order Components in React – CloudBoost

Higher Order Components in React  #higherordercomponents #react #reactjs #javascript #reactjs

  • We must find a way to abstract that repetitive logic in order to avoid going through our codebase every time we want to make a change.What are Higher Order Components?As the name suggests — a Higher Order Component is some special and more important component.
  • If you’ve ever used map, reduce or filter you have already used HOF without even knowing.Similarly to that – Higher Order Components take a component as input and return another component.
  • Some of the more Object Oriented programmers will immediately scream “inheritance”, but have in mind that React favors composition.How do we make a HOC?Let’s start simple and make a HOC that we will use to log the clicks of our users.Here our function takes the component we will be wrapping as an argument and returns a brand new component with all the attached functionality to it.
  • To create our new component we will simply call the function and pass the wrapped one as a parameter.const LogsClicks = else can we do with HOCs?Higher Order Components can be used every time you’ve got repetitive logic in your components.
  • Now when the component mounts and every time it updates, our component will now look at the authenticated property and will redirect to the home page if it’s false.Something to note is that when we’re using the connect helper in order to attach our component to Redux’s store, we are creating another Higher Order Component.

Components are the building blocks of React. We separate our UI into small pieces that are responsible for rendering and managing the state of a particular part of the application. But even though…
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