React: Do children always rerender when the parent component rerenders?

I’ll post your actual code for context: class Application extends React.Component { render() { return ( <div> {/* Clicking this component only logs the parents render function */} <DynamicParent> <Child /> </DynamicParent> {/* Clicking this component logs both the parents and child render functions */} <StaticParent /> </div> ); } } class DynamicParent extends React.Component … Read more

TypeScript: remove key from type/subtraction type

Update for TypeScript 3.5: The Omit<Type, Keys> utility type is now available. Please see Mathias’ answer for an example usage. Old Answer: Since TypeScript 2.8 and the introduction of Exclude, It’s now possible to write this as follows: type Without<T, K> = { [L in Exclude<keyof T, K>]: T[L] }; Or alternatively, and more concisely, … Read more

How can I change this class base higher order component into a functional component?

I agree with siraj, strictly speaking the example in the accepted answer is not a true HOC. The distinguishing feature of a HOC is that it returns a component, whereas the PrivateRoute component in the accepted answer is a component itself. So while it accomplishes what it set out to do just fine, I don’t … Read more

Functions are not valid as a React child. This may happen if you return a Component instead of from render

You are using it as a regular component, but it’s actually a function that returns a component. Try doing something like this: const NewComponent = NewHOC(Movie) And you will use it like this: <NewComponent someProp=”someValue” /> Here is a running example: const NewHOC = (PassedComponent) => { return class extends React.Component { render() { return … Read more