Gemini Explains How Hooks Work with Toast Component
Gemini Explains How Hooks Work with Toast Component
There are two version of this, first one is explanation it extracted from the system, and the second is the one I prompted it to create explanation.
First One: Gemini Explains How Hooks Work with Toast Component
This post explains the changes made to implement a toast notification system, focusing on React concepts like Hooks, Context, and Providers.
Core Concepts
Components
React applications are built using components. A component is a reusable piece of code that defines a part of the user interface.
State
Components can have state. State is data that is managed by the component. When the state of a component changes, React automatically re-renders the component to reflect the new state.
Hooks
Hooks are special functions that let you "hook into" React features. They were introduced in React to allow the use of state and other React features in functional components. Hooks are functions whose names start with use.
useState: This hook lets you add state to a functional component.useEffect: This hook lets you perform side effects in a functional component.useContext: This hook lets you subscribe to React context without introducing nesting.
Context and Providers
Context provides a way to share data between components without having to pass props down manually at every level. The Provider is a component that makes the data available to all the components in the tree below it. Any component in the tree can then access the data using the useContext hook.
Custom Hooks
A custom hook is a JavaScript function whose name starts with use and that calls other hooks. Custom hooks are a way to reuse stateful logic between components.
File-by-File Explanation of Changes
Now, let's look at the changes made to each file.
src/hooks/useToast.js
This file defines a custom hook called useToast. It uses useContext to access the ToastContext and provides a simple way for any component to access the addToast and removeToast functions.
import { useContext } from 'react'; import { ToastContext } from '../components/ToastContext'; export const useToast = () => { return useContext(ToastContext); };src/components/ToastContext.js
This file defines the ToastContext component, which manages the state of the toasts. It uses useState to hold the toasts array, and provides addToast and removeToast functions. It also renders the Toast components.
import React, { createContext, useState, useCallback } from 'react'; import Toast from './Toast'; export const ToastContext = createContext(); let id = 0; export const ToastContext = ({ children }) => { const [toasts, setToasts] = useState([]); const addToast = useCallback((toast) => { const newToast = { ...toast, id: id++ }; setToasts((prevToasts) => { if (prevToasts.length >= 5) { const updatedToasts = prevToasts.slice(0, prevToasts.length - 1); return [newToast, ...updatedToasts]; } return [newToast, ...prevToasts]; }); }, []); const removeToast = useCallback((id) => { setToasts((prevToasts) => prevToasts.filter((toast) => toast.id !== id)); }, []); return ( <ToastContext.Provider value={{ addToast, removeToast }}> {children} <div className="fixed top-28 right-10 z-50"> {toasts.map((toast) => ( <Toast key={toast.id} id={toast.id} title={toast.title} message={toast.message} duration={toast.duration} removeToast={removeToast} /> ))} </div> </ToastContext.Provider> ); };src/components/Toast.js
This file defines the Toast component, which is the UI for a single toast notification. It uses useEffect to set a timer for automatic removal and framer-motion for animations.
import React, { useEffect } from 'react'; import { motion } from 'framer-motion'; import { X } from '@phosphor-icons/react'; const Toast = ({ id, title, message, duration, removeToast }) => { useEffect(() => { const timer = setTimeout(() => { removeToast(id); }, duration); return () => { clearTimeout(timer); }; }, [id, duration, removeToast]); return ( <motion.div initial={{ x: '100%', opacity: 0 }} animate={{ x: 0, opacity: 1 }} exit={{ opacity: 0 }} transition={{ type: 'spring', stiffness: 120, damping: 20 }} className="text-gray-300 py-4 px-10 rounded-lg shadow-lg border backdrop-blur-sm flex items-center justify-between w-96 mb-4" style={{ backgroundColor: 'rgba(68, 64, 59, 0.8)', borderColor: '#5a5e64' }} > <div className="flex flex-col text-sm"> <span>{title}</span> <span>{message}</span> </div> <button onClick={() => removeToast(id)} className="pr-2"> <X size={24} weight="bold" /> </button> </motion.div> ); }; export default Toast;src/App.js
The main component of the application. The ToastContext wraps the entire application to make the toast functionality available everywhere.
import React from 'react'; import { HashRouter as Router } from 'react-router-dom'; import Layout from './components/Layout'; import AnimatedRoutes from './components/AnimatedRoutes'; import { ToastContext } from './components/ToastContext'; function App() { return ( <Router> <ToastContext> <Layout> <AnimatedRoutes /> </Layout> </ToastContext> </Router> ); } export default App;src/pages/BlogPostPage.js
This component uses the useToast hook to show a toast notification when a code block is copied.
// ... imports import { useToast } from '../hooks/useToast'; // ... const CodeBlock = ({ node, inline, className, children, openModal, ...props }) => { const match = /language-(\w+)/.exec(className || ''); const { addToast } = useToast(); const handleCopy = () => { const textToCopy = String(children); if (navigator.clipboard && navigator.clipboard.writeText) { navigator.clipboard.writeText(textToCopy).then(() => { addToast({ title: 'Success', message: 'Copied to clipboard!', duration: 3000 }); }, () => { addToast({ title: 'Error', message: 'Failed to copy!', duration: 3000 }); }); } else { const textArea = document.createElement('textarea'); textArea.value = textToCopy; textArea.style.position = 'fixed'; textArea.style.left = '-9999px'; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { document.execCommand('copy'); addToast({ title: 'Success', message: 'Copied to clipboard!', duration: 3000 }); } catch (err) { addToast({ title: 'Error', message: 'Failed to copy!', duration: 3000 }); } document.body.removeChild(textArea); } }; // ... rest of the component }; // ... rest of the fileSecond One: Gemini Explains How Hooks Work with Toast Component
I gave Gemini the following prompt:
Pretend like I have no idea what react.js is. I want you to explain everything done in the changed files. What is useHook what are hooks and all that. The changes made to App.js, Blogpostpage.js, toast.js, toastprovider.js (and what provider is), useToast.js (what is useXXXX). Explain everything step by step to me. Write everything to
explanation.mdfile. (not exists)
Explanation of the Toast Notification System
This document explains the changes made to the website to implement a toast notification system. The explanation is intended for someone with no prior knowledge of React.js.
Core Concepts
Before diving into the code changes, let's understand some fundamental concepts of React.
Components
React applications are built using components. A component is a reusable piece of code that defines a part of the user interface. For example, a button, a form, or a navigation bar can all be components. Components can be nested inside other components to create complex user interfaces.
State
Components can have state. State is data that is managed by the component. When the state of a component changes, React automatically re-renders the component to reflect the new state. For example, a component that displays a counter might have a count state. When the count is incremented, the component re-renders to display the new value.
Hooks
Hooks are special functions that let you "hook into" React features. They were introduced in React to allow the use of state and other React features in functional components (which are simpler than class-based components). Hooks are functions whose names start with use. Here are some common hooks:
useState: This hook lets you add state to a functional component.useEffect: This hook lets you perform side effects in a functional component. Side effects are operations that are not directly related to rendering the UI, such as fetching data from a server or setting up a timer.useContext: This hook lets you subscribe to React context without introducing nesting.
Context and Providers
In a React application, data is typically passed from parent components to child components via props. However, this can become cumbersome for data that needs to be accessed by many components at different nesting levels.
Context provides a way to share data between components without having to pass props down manually at every level. The Provider is a component that makes the data available to all the components in the tree below it. Any component in the tree can then access the data using the useContext hook.
Custom Hooks
A custom hook is a JavaScript function whose name starts with use and that calls other hooks. Custom hooks are a way to reuse stateful logic between components. For example, you could create a custom hook that fetches data from a server and returns the data and a loading state. This hook could then be used in any component that needs to fetch data.
File-by-File Explanation of Changes
Now, let's look at the changes made to each file.
src/hooks/useToast.js
This file defines a custom hook called useToast.
import { useContext } from 'react'; import { ToastContext } from '../components/ToastContext'; export const useToast = () => { return useContext(ToastContext); };useContext(ToastContext): This line uses theuseContexthook to access the data provided by theToastContext. TheToastContextis created inToastContext.js.export const useToast: This line exports theuseToasthook so that it can be used in other components.
This custom hook provides a simple way for any component to access the addToast and removeToast functions without having to pass them down as props.
src/components/ToastContext.js
This file defines the ToastContext component, which is responsible for managing the state of the toasts.
import React, { createContext, useState, useCallback } from 'react'; import Toast from './Toast'; export const ToastContext = createContext(); let id = 0; export const ToastContext = ({ children }) => { const [toasts, setToasts] = useState([]); const addToast = useCallback((toast) => { const newToast = { ...toast, id: id++ }; setToasts((prevToasts) => { if (prevToasts.length >= 5) { const updatedToasts = prevToasts.slice(0, prevToasts.length - 1); return [newToast, ...updatedToasts]; } return [newToast, ...prevToasts]; }); }, []); const removeToast = useCallback((id) => { setToasts((prevToasts) => prevToasts.filter((toast) => toast.id !== id)); }, []); return ( <ToastContext.Provider value={{ addToast, removeToast }}> {children} <div className="fixed top-28 right-10 z-50"> {toasts.map((toast) => ( <Toast key={toast.id} id={toast.id} title={toast.title} message={toast.message} duration={toast.duration} removeToast={removeToast} /> ))} </div> </ToastContext.Provider> ); };export const ToastContext = createContext();: This line creates a new context object.const [toasts, setToasts] = useState([]);: This line uses theuseStatehook to create atoastsstate variable, which is an array that will hold all the toast objects.addToast: This function adds a new toast to thetoastsarray. It also ensures that there are at most 5 toasts at any given time.removeToast: This function removes a toast from thetoastsarray.<ToastContext.Provider value={{ addToast, removeToast }}>: This is the provider component. It makes theaddToastandremoveToastfunctions available to all the components in the tree below it.{toasts.map((toast) => ...)}: This code maps over thetoastsarray and renders aToastcomponent for each toast object.
src/components/Toast.js
This file defines the Toast component, which is the UI for a single toast notification.
import React, { useEffect } from 'react'; import { motion } from 'framer-motion'; import { X } from '@phosphor-icons/react'; const Toast = ({ id, title, message, duration, removeToast }) => { useEffect(() => { const timer = setTimeout(() => { removeToast(id); }, duration); return () => { clearTimeout(timer); }; }, [id, duration, removeToast]); return ( <motion.div initial={{ x: '100%', opacity: 0 }} animate={{ x: 0, opacity: 1 }} exit={{ opacity: 0 }} transition={{ type: 'spring', stiffness: 120, damping: 20 }} className="text-gray-300 py-4 px-10 rounded-lg shadow-lg border backdrop-blur-sm flex items-center justify-between w-96 mb-4" style={{ backgroundColor: 'rgba(68, 64, 59, 0.8)', borderColor: '#5a5e64' }} > <div className="flex flex-col text-sm"> <span>{title}</span> <span>{message}</span> </div> <button onClick={() => removeToast(id)} className="pr-2"> <X size={24} weight="bold" /> </button> </motion.div> ); }; export default Toast;useEffect(() => { ... }, [id, duration, removeToast]);: This hook sets a timer to automatically remove the toast after a certain duration. The dependency array[id, duration, removeToast]ensures that the timer is only set once when the component is first rendered.<motion.div ...>: This is a component from theframer-motionlibrary that provides animations. Theinitial,animate, andexitprops define the animations for when the toast appears and disappears.
src/App.js
This is the main component of the application. The only change here was to wrap the entire application with the ToastContext.
import React from 'react'; import { HashRouter as Router } from 'react-router-dom'; import Layout from './components/Layout'; import AnimatedRoutes from './components/AnimatedRoutes'; import { ToastContext } from './components/ToastContext'; function App() { return ( <Router> <ToastContext> <Layout> <AnimatedRoutes /> </Layout> </ToastContext> </Router> ); } export default App;<ToastContext>: By wrapping theLayoutcomponent with theToastContext, we make theaddToastandremoveToastfunctions available to all the components in the application.
src/pages/BlogPostPage.js
This component displays a single blog post. The change here was to use the useToast hook to show a toast notification when the user copies a code block.
// ... imports import { useToast } from '../hooks/useToast'; // ... const CodeBlock = ({ node, inline, className, children, openModal, ...props }) => { const match = /language-(\w+)/.exec(className || ''); const { addToast } = useToast(); const handleCopy = () => { const textToCopy = String(children); if (navigator.clipboard && navigator.clipboard.writeText) { navigator.clipboard.writeText(textToCopy).then(() => { addToast({ title: 'Success', message: 'Copied to clipboard!', duration: 3000 }); }, () => { addToast({ title: 'Error', message: 'Failed to copy!', duration: 3000 }); }); } else { const textArea = document.createElement('textarea'); textArea.value = textToCopy; textArea.style.position = 'fixed'; textArea.style.left = '-9999px'; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { document.execCommand('copy'); addToast({ title: 'Success', message: 'Copied to clipboard!', duration: 3000 }); } catch (err) { addToast({ title: 'Error', message: 'Failed to copy!', duration: 3000 }); } document.body.removeChild(textArea); } }; // ... rest of the component }; // ... rest of the fileconst { addToast } = useToast();: This line uses theuseToasthook to get theaddToastfunction.addToast({ title: 'Success', message: 'Copied to clipboard!', duration: 3000 });: This line calls theaddToastfunction to show a toast notification.
This change demonstrates how the useToast hook can be used in any component to easily show toast notifications without having to worry about the implementation details.