Pass setstate to child typescript

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When passing the setState function to a child component in TypeScript, you need to follow the steps below:

  1. Create a state variable and its setter function in the parent component. For example:

    const [name, setName] = useState("");
  2. Define a callback function in the parent component that handles the state update. This function should update the state using the setter function. For example:

    const handleNameChange = (newName: string) => {
  setName(newName);
}
  3. Pass the callback function as a prop to the child component. For example:

    <ChildComponent onNameChange={handleNameChange} />
  4. In the child component, define the prop type for the callback function using the appropriate interface. For example:

    interface ChildProps {
  onNameChange: (newName: string) => void;
}
  5. Inside the child component, you can use the callback function to update the parent’s state. For example, you can call it with a new name when a button is clicked:

    props.onNameChange("John");

By following these steps, you can pass the setState function to a child component in TypeScript and update the parent’s state from the child.

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In the example above, we have a parent component that maintains a state variable called `name` using the `useState` hook. We also define a callback function `handleNameChange` that updates the `name` state variable.

The parent component passes the `handleNameChange` function as a prop to the child component ``.

In the child component, we define the prop type for the `onNameChange` callback function using the `interface ChildProps`. This prop type specifies that the `onNameChange` function takes a `newName` parameter of type `string` and returns `void`.

Inside the child component, we can use the `props.onNameChange` callback function to update the parent’s state. For example, we can call it with a new name when a button is clicked:

“`typescript
props.onNameChange(“John”);
“`

This will trigger the `handleNameChange` function in the parent component, which will update the `name` state variable with the new name.

By following these steps, you can pass the `setState` function to a child component in TypeScript and update the parent’s state from the child.

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