What is the purpose of the defaultProps property in a React component?

What is the purpose of the defaultProps property in a React component?

• A. To set default values for props when they are not provided
• B. To define default state
• C. To register prop types
• D. To manage event handlers

Answer: (A)

Default props provide fallback values for props that aren’t supplied by the parent. If a prop is omitted, the component uses the value from defaultProps, so rendering remains predictable rather than showing undefined. The explicit values you pass override the defaults, letting you customize when needed. This makes reusable components safer and easier to use, because you can rely on sensible defaults (for example, a Button might default to a particular label or style). In class components you commonly see defaultProps defined, but function components can use similar ideas through default parameters or destructuring defaults as well.

Default props provide fallback values for props that aren’t supplied by the parent. If a prop is omitted, the component uses the value from defaultProps, so rendering remains predictable rather than showing undefined. The explicit values you pass override the defaults, letting you customize when needed. This makes reusable components safer and easier to use, because you can rely on sensible defaults (for example, a Button might default to a particular label or style). In class components you commonly see defaultProps defined, but function components can use similar ideas through default parameters or destructuring defaults as well.