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Passing data related coding questions

👩‍💻 Technical question

I don't understand React props. Could you give me more examples?

🤖 SheCodes Athena says:

Answered in 7.71 seconds

Sure, I'd be happy to help you understand React props better!

In React, props (short for "properties") are a mechanism for passing data from a parent component to a child component. Props are read-only and should not be modified within a component. Here are some examples to illustrate how props work:

  1. Passing a string prop:
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// Parent component function Greeting() { return <Child name="Bob" />; } // Child component function Child(props) { return <p>Hello, {props.name}!</p>; }

In this example, the parent component Greeting is passing a prop called name with the value "Bob" to its child component Child. The child component can access this value via the props parameter passed to its function. In this case, we're using the value of name to render a personalized greeting.

  1. Passing an object prop:
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// Parent component function ProductList() { const products = [ { name: "iPhone", price: 999 }, { name: "MacBook Pro", price: 1499 }, { name: "iPad", price: 329 }, ]; return <ProductTable products={products} />; } // Child component function ProductTable(props) { return ( <table> <thead> <tr> <th>Name</th> <th>Price</th> </tr> </thead> <tbody> {props.products.map((product) => ( <ProductRow key={product.name} product={product} /> ))} </tbody> </table> ); } // Grandchild component function ProductRow(props) { return ( <tr> <td>{props.product.name}</td> <td>{props.product.price}</td> </tr> ); }

In this example, the parent component ProductList is passing an array of product objects to its child component ProductTable via the prop products. The child component then maps over this array to render a table row for each product, passing each individual product object down to its grandchild component ProductRow via the prop product.

  1. Passing a function prop:
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// Parent component function ButtonToolbar() { function handleClick() { console.log("Button clicked!"); } return <Button onClick={handleClick}>Click me</Button>; } // Child component function Button(props) { return <button onClick={props.onClick}>{props.children}</button>; }

In this example, the parent component ButtonToolbar defines a function handleClick and passes it down to its child component Button via the prop onClick. The child component attaches this function as a click event handler to the actual <button> element it renders. When the button is clicked, React calls the function passed in as the onClick prop, which logs "Button clicked!" to the console. This allows the child component to delegate some behavior to its parent component.

👩‍💻 Technical question

Asked 2 years ago in React by Milagros

how to pass information from one component to another?

🤖 SheCodes Athena says:

Answered in 3.08 seconds

In React, you can pass information from one component to another through props.

Props (short for properties) are a way of passing data from parent to child components. You can pass any data type as a prop, such as strings, numbers, arrays, functions, or objects.

Here's an example:

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// Parent component import Child from './Child'; function Parent() { const message = "Hello from Parent"; return <Child text={message} />; } // Child component function Child(props) { return <p>{props.text}</p>; }

In this example, the Parent component passes the message variable as a prop to the Child component. The Child component receives the prop through its props parameter and displays it inside a paragraph element.

You can learn more about props in React from the official documentation: https://reactjs.org/docs/components-and-props.html

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