Gathering sand into a tower, making a little progress every day
⭐ Column introduction
Front-end entry journey: Explore the wonderful world of web development. Remember to click on the link above or on the right to subscribe to this column. Geometry will take you on a front-end journey.
Welcome to the front-end entry journey! This column is tailor-made for those who are interested in web development and have just entered the front-end field. Whether you are a complete novice or a developer with some basic knowledge, here will provide you with a systematic and friendly learning platform. In this column, we will update it every day in the form of questions and answers, presenting you with selected front-end knowledge points and answers to frequently asked questions. Through the Q&A format, we hope to respond more directly to readers’ questions about front-end technology and help everyone gradually establish a solid foundation. Whether it's HTML, CSS, JavaScript, or various common frameworks and tools, we'll explain concepts in a simple and easy-to-understand way, and provide practical examples and exercises to solidify what you've learned. At the same time, we will also share some practical tips and best practices to help you better understand and apply various technologies in front-end development.
Not only that, we will also regularly launch some practical project tutorials so that you can apply the knowledge you have learned to actual development. Through the practice of actual projects, you will be able to better understand the workflow and methodology of front-end development, and develop your own ability to solve problems and develop independently. We believe that only by continuous accumulation and practice can we truly master front-end development technology. So, get ready for the challenge and bravely embark on this front-end entry journey! Whether you are looking for a career change, upskilling or fulfilling personal interests, we are dedicated to providing you with the best learning resources and support. Let's explore the wonderful world of web development together! Join the front-end entry journey and become an outstanding front-end developer! Let's set sail on the front-end journey , skip the pictures below and start today's text! ! !
⭐ Functional Programming
Functional Programming (FP) is a programming paradigm that treats calculations as the evaluation of mathematical functions and avoids mutable state and mutable data. Functional programming emphasizes function purity, immutability, and the use of higher-order functions, which makes it a powerful tool for writing robust, maintainable, and testable code.
In JavaScript, the concepts of functional programming can be implemented in the following ways:
⭐Pure Functions
Pure functions are one of the core concepts of functional programming. It is a function with the following properties:
- Given the same input, always returns the same output.
- Execution of the function does not change the state of the program or cause side effects.
Example:
// 纯函数示例
function add(a, b) {
return a + b;
}
const result = add(2, 3); // 结果始终是5，不会引起副作用
⭐ Immutability
In functional programming, data is usually immutable, meaning that once created, it cannot be modified. When data needs to be modified, a new copy of the data is created instead of modifying the original data directly.
Example:
// 不可变性示例
const arr = [1, 2, 3];
const newArr = [...arr, 4]; // 创建了一个新数组，而不是修改原数组
console.log(arr); // [1, 2, 3]
console.log(newArr); // [1, 2, 3, 4]
⭐ Higher-Order Functions
A higher-order function is a function that can accept one or more functions as parameters, or return a function as a result. They are used to operate on other functions, which is very common in functional programming.
Example:
// 高阶函数示例
function multiplyBy(factor) {
return function (number) {
return number * factor;
};
}
const double = multiplyBy(2); // 返回一个新函数
const result = double(5); // 结果为10
⭐ Function Composition
Function composition is the process of combining multiple functions to create new functions. It can help combine multiple small functions into larger, more complex functions.
Example:
// 函数组合示例
const add = (x) => x + 2;
const multiply = (x) => x * 3;
const compose = (f, g) => (x) => f(g(x));
const addAndMultiply = compose(multiply, add);
const result = addAndMultiply(5); // 先加2再乘3，结果为21
⭐Declarative Programming
Functional programming encourages the use of a declarative programming style, where programs are structured by describing what to do rather than how to do it. This makes the code easier to understand and maintain.
Example:
// 声明式编程示例
const numbers = [1, 2, 3, 4, 5];
// 使用map进行声明式变换
const doubledNumbers = numbers.map((num) => num * 2);
// 使用filter进行声明式筛选
const evenNumbers = numbers.filter((num) => num % 2 === 0);
Functional programming concepts can improve code readability, maintainability, and testability. In JavaScript, you can use functions as first-class citizens and higher-order functions such as map, filter, reduceetc. to implement the concept of functional programming.
⭐Write at the end
This column is suitable for a wide range of readers, and is suitable for front-end beginners; or those who have not learned front-end and are interested in front-end, or back-end students who want to better show themselves and expand some front-end knowledge points during the interview process, so If you have the basics of front-end and follow this column, it can also help you to find and fill in the gaps to a great extent. Since the blogger himself does the content output, if there are any flaws in the article, you can contact me through the left side of the homepage. , let’s make progress together, and at the same time, I also recommend several columns to everyone. Interested partners can subscribe: In addition to the columns below, you can also go to my homepage to see other columns;
Front-end games (free) This column will take you into a world full of creativity and fun. By using the basic knowledge of HTML, CSS and JavaScript, we will build various interesting page games together. Whether you are a beginner or have some front-end development experience, this column is for you. We'll start with the basics and walk you through the skills you need to build a page game. Through practical cases and exercises, you will learn how to use HTML to build page structure, use CSS to beautify the game interface, and use JavaScript to add interactive and dynamic effects to the game. In this column, we'll cover various types of mini-games, including maze games, brick breaker, snake, minesweeper, calculators, plane battles, tic-tac-toe, puzzles, mazes, and more. Each project guides you through the building process in concise and clear steps, with detailed explanations and code examples. At the same time, we will also share some optimization tips and best practices to help you improve page performance and user experience. Whether you are looking for an interesting project to exercise your front-end skills, or are interested in page game development, the front-end games column will be your best choice. Click to subscribe to the front-end games column
Vue3 Transparent Tutorial [From Zero to One] (Paid) Welcome to the Vue3 Transparent Tutorial! This column aims to provide everyone with comprehensive technical knowledge related to Vue3. If you have some Vue2 experience, this column can help you master the core concepts and usage of Vue3. We will start from scratch and guide you step by step to build a complete Vue application. Through practical cases and exercises, you will learn how to use Vue3's template syntax, component development, state management, routing and other functions. We will also introduce some advanced features, such as Composition API and Teleport, to help you better understand and apply the new features of Vue3. In this column, we'll guide you through each project in concise and clear steps, with detailed explanations and sample code. At the same time, we will also share some common problems and solutions in Vue3 development to help you overcome difficulties and improve development efficiency. Whether you want to learn Vue3 in depth or need a comprehensive guide to building a front-end project, the Vue3 thorough tutorial column will become an indispensable resource for you. Click to subscribe to the Vue3 Transparent Tutorial [From Zero to One] column
TypeScript Getting Started Guide (Free) is a column designed to help you quickly get started and master TypeScript related technologies. Through concise and clear language and rich sample code, we will explain the basic concepts, syntax and features of TypeScript in depth. Whether you are a beginner or an experienced developer, you can find a learning path that suits you here. From core features such as type annotations, interfaces, and classes to modular development, tool configuration, and integration with common front-end frameworks, we will comprehensively cover all aspects. By reading this column, you will be able to improve the reliability and maintainability of JavaScript code, and provide better code quality and development efficiency for your projects. Let’s embark on this exciting and challenging TypeScript journey together! Click to subscribe to the TypeScript Getting Started Guide column
