What is props in React?

What is props in React?

• A. Information that gets passed from one component to another
• B. A lifecycle method
• C. A CSS class name
• D. A store for global variables

Answer: (A)

Props are the inputs a component receives from its parent. They carry data and callbacks into a component so it can render based on that information. Props flow downward from parent to child and are read-only inside the child, meaning a component can’t modify its props—if something needs to change, the parent should pass new props or the child can call a callback function provided via props and let the parent update state. In code, you pass props by adding attributes to the JSX element, and inside the component you access them via an object called props (or by destructuring). Props can be primitive values, objects, arrays, or functions, allowing you to customize how a component behaves or renders. They aren’t lifecycle methods, not a CSS class name, and not a global store for variables. Those roles correspond to other concepts like lifecycle hooks, className for styling, and stores or context for global state.

Props are the inputs a component receives from its parent. They carry data and callbacks into a component so it can render based on that information. Props flow downward from parent to child and are read-only inside the child, meaning a component can’t modify its props—if something needs to change, the parent should pass new props or the child can call a callback function provided via props and let the parent update state.

In code, you pass props by adding attributes to the JSX element, and inside the component you access them via an object called props (or by destructuring). Props can be primitive values, objects, arrays, or functions, allowing you to customize how a component behaves or renders.

They aren’t lifecycle methods, not a CSS class name, and not a global store for variables. Those roles correspond to other concepts like lifecycle hooks, className for styling, and stores or context for global state.