Props and state are core React concepts that work identically in React Native: props pass data into a component (read-only inputs), while state holds data that can change over time (triggering re-renders). Understanding them is fundamental.
() {
;
}
< name= age={} />
import { useState } from 'react';
function Counter() {
const [count, setCount] = useState(0); // declare state + its setter
return (
<TouchableOpacity onPress={() => setCount(count + 1)}>
<Text>{count}</Text> {/* uses state */}
</TouchableOpacity>
);
}
// → calling setCount updates state → component RE-RENDERS with the new value
State is internal, changeable data; updating it (via the setter from useState) triggers a re-render — how the UI reflects changes.
PROPS → passed IN from the parent; READ-ONLY (the component doesn't change them);
for configuration/data from outside
STATE → internal to the component; CHANGEABLE (via setState/useState); triggers re-renders;
for data that changes over time (user input, toggles, fetched data)
→ Data flows DOWN via props; state changes drive UI updates. (Same as React for web.)
Understanding props and state is fundamental to React Native because they're core React concepts central to how components work and how UIs update, so it's must-know knowledge. Props (read-only data passed into a component from its parent, flowing down the component tree) are how components receive configuration and data from outside, enabling reusable, composable components. State (internal, changeable data managed via the useState hook, where updating it triggers a re-render) is how components hold and respond to data that changes over time (user input, toggles, fetched data) — the mechanism by which UIs reflect changes.
Understanding the distinction — props passed in and read-only (for external data/configuration) versus state being internal and changeable (for data that changes, driving re-renders) — and the principle that data flows down via props while state changes drive UI updates is fundamental to building React Native (and React) apps correctly.
These are exactly the same concepts as React for web, so understanding them transfers directly and is essential for anyone building React Native components.
Getting props and state right (passing data via props, managing changing data with state, understanding the unidirectional data flow) is core to functional, correct components.
Since props and state are central to how React Native (and React) components work — receiving data (props) and managing change (state) to drive UI updates — and understanding them is fundamental to building any React Native app correctly, understanding props and state is essential, foundational React Native knowledge — core concepts every React Native developer must understand, identical to web React (so the knowledge transfers), and fundamental to building components that receive data and respond to change, the basic mechanics of React Native UI development.