The following features are associated with reacting to lifecycle methods.
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A JavaScript library for building fast and interactive interfaces for mobile and web applications, React is built for web and mobile development.A front-end component-based library that only handles the application's view layer.
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React.js, commonly referred to as React, is a popular JavaScript library for building user interfaces, particularly for single-page applications where user interactions are dynamic and frequent. Developed and maintained by Facebook, React allows developers to create reusable UI components that update efficiently in response to changes in data. Here are some key concepts and features associated with React:
Component-Based Architecture:
React is based on a component-based architecture, where the UI is broken down into independent, reusable components. Components can be composed together to create complex user interfaces.
Virtual DOM:
React uses a virtual DOM (Document Object Model) to optimize the rendering process. Instead of directly manipulating the actual DOM, React creates a virtual representation of it in memory and updates only the parts that have changed. This minimizes the number of updates to the real DOM, making the application more efficient.
JSX (JavaScript XML):
React uses JSX, a syntax extension for JavaScript that allows you to write HTML-like code within your JavaScript files. JSX makes it easier to visualize and work with the component structure.
jsx
Copy code
const element = <h1>Hello, React!</h1>;
Unidirectional Data Flow:
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State and Props:
React components can have state, which represents the internal data of a component. Props (short for properties) are used to pass data from a parent component to a child component. Changes in state trigger component updates, and props help to make components dynamic and configurable.
Lifecycle Methods:
React components have lifecycle methods that allow developers to perform actions at different stages of a component's existence, such as when it is created, updated, or destroyed.
Hooks:
Introduced in React 16.8, hooks are functions that allow functional components to manage state and side effects. They provide a way to use state and other React features in functional components without the need for class components.
jsx
Copy code
import { useState } from 'react';
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const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
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The PostgreSQL database system is an advanced, enterprise-class, and open-source relational database system.In addition to SQL, PostgreSQL supports JSON querying as well as non-relational queries.
What Makes PostgreSQL Stand Out?
PostgreSQL is the first database management system that implements multi-version concurrency control (MVCC) feature, even before Oracle.
PostgreSQL is a general-purpose object-relational database management system. It allows us to add custom functions developed using different programming languages such as C/C++, Java, etc.
Procedural Languages Support
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DDL - data definition language
Data definition language (DDL) is used the following commands:
Data type declaration
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ALTER - modifies an existing database object.
DROP - deletes an existing database, table, index or procedure.
TRUNCATE TABLE - empties a table for reuse.
DML - data manipulation language
Data manipulation language is used to work with tables and their contents as in:
INSERT - inserts new rows in a table.
UPDATE - updates existing rows in the table.
DELETE - deletes rows from a table.
SELECT - the main method for querying data from the database.
Advantages of PostgreSQL
Below are the main advantages/benefits of PostgreSQL:
PostgreSQL can run dynamic websites and web apps as a LAMP stack option.
PostgreSQL’s write-ahead logging makes it a highly fault-tolerant database.
PostgreSQL source code is freely available under an open source license.
Low maintenance and administration for both embedded and enterprise use of PostgreSQL.
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Postgres is not owned by one organization. So, it has had trouble getting its name out there despite being fully featured and comparable to other DBMS systems
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The following features are associated with reacting to lifecycle methods.
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- 3. Let us look at the essential and most demanding features : 1. JSX: JSX means JavaScript XML. It is an extension of JS language syntax. It provides a way to render components using a syntax similar to HTML. 2. Virtual Document Object Model:React make an in-memory data structure cache, then it computes the difference between the previous DOM and the new one and then updates the changes or mutations performed. 3. Testability: React views are used as the state’s functions where the state determines the behavior of the component. Therefore we can make changes to the state and then pass it to a view the ReactJS and then determine the output. Features of React
- 4. 4. SSR:It permits to pre-render the initial state of the components at the server-side. The browser can render without waiting for all the JavaScript to be executed or loaded. This makes web pages to load faster. 5. One Way Data Binding:It allows one-way flow of data, i.e. one-way data binding. Due to this feature, there is better control over the application. 6. Simplicity:JSX files make the application simple and understandable. Standard JavaScript can be used to code, but the usage of JSX makes it easier. 7. Learning Curve:In comparison to other frameworks, the learning curve of React is low. Beginners having basic programming language can also learn to React easily.
- 5. SEO friendly It is easy to create test cases for UI. React Components can be reused easily. Ensures faster rendering. Debugging is easy. Ease of Migration. Enhances productivity. Writing components is easy. Stable code. Has a helpful developer toolset. Advantages
- 6. Disadvantages The high pace of development. Poor documentation. Additional SEO hassle. View-oriented only. Large size library. The learning curve for beginners. Requires manual processing of data changes. I need more code in some cases.