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Showing posts from February, 2023

Understanding and Implementing Schemas in Python

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Understanding and Implementing Schemas in Python Introduction In the world of programming, particularly in the context of data management and validation, schemas play a vital role. A schema is essentially a blueprint or a predefined structure that defines the expected format, data types, and constraints for a given data entity. In this blog, we will delve into the concept of schemas in Python, exploring what they are, why they are important, and how you can implement them in your projects. What is a Schema? A schema serves as a contract between different components of a system, ensuring that data is consistent, valid, and well-structured. It defines the rules for how data should be organized, what fields it should contain, and what types of values those fields can hold. In essence, a schema acts as a set of rules that data must adhere to in order to be considered valid. Why Are Schemas Important? Data Validation: Schemas provide a way to validate incoming data. When data is received o
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Profiler in React Js

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Profiler in React Js ReactJS includes a built-in profiling tool that allows you to measure the performance of your application and identify performance bottlenecks. Here's how to use it: First, make sure you are running a version of React that supports the profiler. Profiling was added in version 16.5.0, so make sure you have at least that version installed. Import the Profiler component from the react package: import { Profiler } from 'react'; 3. Wrap the component or tree of components that you want to profile with the Profiler component: <Profiler id="myApp" onRender={callback}> <MyApp /> </Profiler> The id prop is a string that identifies this profiler instance, and callback is a function that will be called every time a component is rendered within the profiler. 4. Define the callback function to log the results of the profiling: function callback(id, phase, actualDuration, baseDuration, startTime, commitTime, interactions) { con
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Simple todo app using ReactJS and Recoil

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Simple todo app using ReactJS and Recoil First, you'll need to install the Recoil package: npm install recoil Next, create a new file called TodoItem.js with the following code: import React from 'react'; import { useRecoilState } from 'recoil'; import { todoListState } from './TodoList'; function TodoItem({ item }) { const [todoList, setTodoList] = useRecoilState(todoListState); const deleteItem = () => { const newList = todoList.filter((todo) => todo.id !== item.id); setTodoList(newList); }; return ( <div> <input type="checkbox" checked={item.isComplete} /> <span>{item.text}</span> <button onClick={deleteItem}>Delete</button> </div> ); } export default TodoItem; This code defines a new component called TodoItem that takes in a item prop representing a single item in the todo list. The component renders a checkbox, the text of the todo item, and a d
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Simple todo app using ReactJS and MobX

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Simple todo app using ReactJS and MobX 1. Create a new ReactJS app using create-react-app. You can use the following command in your terminal: npx create-react-app todo-app 2. Install the necessary dependencies: cd todo-app npm install mobx mobx-react 3. Create a new file called TodoStore.js in the src directory with the following code: import { makeObservable, observable, action } from 'mobx'; class TodoStore { todos = []; constructor() { makeObservable(this, { todos: observable, addTodo: action, removeTodo: action, completeTodo: action, }); } addTodo = (todo) => { this.todos.push({ id: Math.random(), text: todo, completed: false, }); }; removeTodo = (todo) => { this.todos = this.todos.filter((t) => t.id !== todo.id); }; completeTodo = (todo) => { todo.completed = !todo.completed; }; } const store = new TodoStore(); export default store; 4. Create a new file called TodoLi
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useState hook in React Js

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useState hook in React Js In React, useState is a built-in hook that allows functional components to have stateful behavior. It is used to declare state variables and update them as necessary. The useState hook returns an array of two values: the current state and a function to update the state. Here is the basic syntax of useState : import React, { useState } from 'react'; function Example() { const [state, setState] = useState(initialState); // ... } The first element of the returned array, state , is the current state of the component. The second element, setState , is a function that allows you to update the state. You can call this function with a new value to update the state. The useState hook takes one argument, which is the initial state of the component. This argument can be any value, including objects and arrays. When the component is first rendered, the useState hook initializes the state to this value. Here is an example of how to use useState to decl
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Custom Event in React Js

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Custom Event in React Js In React, you can create a custom event using the CustomEvent constructor provided by the browser's built-in window object, and then dispatch the event using the dispatchEvent() method. Here's an example of how to create and dispatch a custom event in a React functional component: import React, { useRef } from 'react'; function CustomEventExample() { const buttonRef = useRef(null); const handleButtonClick = () => { const customEvent = new CustomEvent('myEvent', { detail: { message: 'Hello world!' } }); buttonRef.current.dispatchEvent(customEvent); }; return ( <div> <button onClick={handleButtonClick}>Dispatch custom event</button> <div ref={buttonRef}></div> </div> ); } In this example, we create a new CustomEvent object with the name 'myEvent' and a detail object containing a message. We then dispatch the event on a button element using
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