Web Reference: Jul 23, 2025 · defaultProps is an essential feature in React that ensures components always have a value for their props, even if the parent component doesn't pass one. It makes your code more predictable and helps avoid errors from undefined props. It's a good idea to annotate defaultProps with Partial so that it type-checks against your props, but you don't have to supply every required property with a default value, which makes no sense since required properties should never need a default. React apps are usually a composition of several independent components that make up the UI of the application. A React component is simply a JavaScript function that takes an object of arbitrary inputs, known as props, and returns React elements that describe what should be rendered on the UI: The example above defines a very simple ReactHeader com...
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