Exploring TypeScript: The Way to Improve Code Quality

With the development of front-end development, JavaScript has become one of the most popular programming languages. However, JavaScript is a 弱类型unique language, it is not a type-safe language. This can cause problems in larger projects, such as 代码错误, 难以维护and , 扩展性差etc. TypeScriptThe emergence of is to solve these problems.

The official introduction to TypeScript is: 它是 JavaScript 的超集 ，它可以编译成纯 JavaScript ，并且可以在任何浏览器、任何计算机和任何操作系统上运行。And TypeScript is 完全开源yes .

Differences from JavaScript

• 类型系统
  TypeScript has static type checking, which can check the type errors in the code at compile time, which can avoid type errors at runtime. JavaScript, on the other hand, is a dynamically typed language, which does type checking at runtime.

  //js
  let obj = {
        
        };
  obj = '我是一个字符串';
  // 此时 js 是不会报错的，并且赋值成功。
  
  //ts
  let obj:Object = {
        
        };
  obj = '我是一个字符串';
  // 此时 ts 会直接报出语法错误，并且编译不成功
  

• 语言特性
  TypeScript includes all the features of JavaScript, and adds some new features and language features, such as classes and interfaces, namespaces, tuples, etc.
  interface

  interface LabelledValue {
        
        
  	label: string;
  }
  
  function printLabel(labelledObj: LabelledValue) {
        
        
  	console.log(labelledObj.label);
  }
  
  let myObj = {
        
        size: 10, label: "Size 10 Object"};
  printLabel(myObj);
  

  tuple

  //元组类型允许表示一个已知元素数量和类型的数组，各元素的类型不必相同。 比如，你可以定义一对值分别为 string和number类型的元组。
  let x: [string, number];
  

• 编译过程
  TypeScript requires code to be compiled to JavaScript before it can run in the browser. This means that when using TypeScript, you need to install and configure the TypeScript compiler, and it also requires a certain compilation time. JavaScript, on the other hand, can run directly in the browser or in the Node.js environment.

• 生态系统
  JavaScript has a broad ecosystem and community support, with tons of libraries, frameworks, and tools available to developers. The TypeScript ecosystem is relatively small but growing.

In summary, TypeScript has stronger type checking and language features than JavaScript, but requires compilation and configuration. When choosing a programming language, you need to choose according to your actual needs.

Advantages of TypeScript

• 类型安全
  Typescript has a type system that allows developers to find type errors in the process of writing code and reduce the possibility of errors.
• 代码可读性高
  Typescript can make the code more readable and reduce the maintenance cost of the code through type annotations and interface definitions.
• 编译时错误检测
  Typescript will check for errors at compile time, which can detect problems in advance and reduce the probability of finding errors at runtime.
• 先进的 ES6/7/8 支持
  Typescript supports the latest ECMAScript standard, which enables developers to use the latest syntax to improve code efficiency and readability.
• 兼容性和支持性
  Typescript can be converted to JavaScript, can run in all modern browsers and Node.js, and can also be integrated into various development tools.

Disadvantages of TypeScript

• 有一定的学习曲线
  Since Typescript has a type system and enforced type checking, it might take some time for developers to learn how to use it.
• 增加了开发成本
  Because Typescript needs to add type annotations and interface definitions when writing code, using Typescript in some small projects may increase development costs.
• For some small-scale projects, using Typescript may appear a bit "heavy" 增加了项目的复杂度.
• Developers need to have a certain understanding and mastery of Typescript, otherwise it will affect the development progress of the project.

write at the end

In the field of software development today, the importance of code quality has become increasingly prominent. In this context, more and more developers are paying attention to TypeScript, a strongly typed JavaScript language, because it can detect type errors during code writing and reduce the possibility of errors. In the future, I will open a column to explore TypeScript in depth with you, analyze its advantages and application scenarios in improving code quality, and the knowledge and skills developers need to master. Whether you want to further improve your development capabilities, or want to apply TypeScript in projects, Senior Mo and Mr. Mo will provide readers with in-depth insights and practical suggestions. Let's embark on the road of code quality improvement together!