In teaching, when students are learning vue3.x, they often ask about the relationship between typescript and vue3.x. They feel that these two technologies are always tied together. Let Lao Zhao give a unified answer:
Then learn vue3.x, why is it required to master typescript
Vue 3.x is a library written in TypeScript, it has built-in support for TypeScript, and it is recommended to use TypeScript to write Vue applications. This is because:
type safety
TypeScript has a strong type system that detects type errors at compile time, reducing runtime errors. In Vue applications, using TypeScript can improve the type safety of the code, reduce type errors, and improve the readability and maintainability of the code.
editor support
Many popular editors like VSCode have built-in support for TypeScript, including code completion, code hints, type checking, and more. Using TypeScript to write Vue applications can get better editor support and improve code writing efficiency and quality.
Maintainability and Scalability
In large Vue applications, using TypeScript can make the code easier to maintain and extend. By using features such as interfaces and type aliases, you can make your code clearer and easier to understand, reducing the cost of code maintenance and refactoring.
In short, learning TypeScript can help developers write more robust and readable Vue applications, improve development efficiency and code quality, so Vue 3.x also mentions TypeScript in the recommendation, and it is recommended to also learn Vue 3.x To master TypeScript.
I feel that the code written in typescript is very complicated and long-winded
Compared with JavaScript, TypeScript may be slightly more complex and verbose in syntax, but from another perspective, TypeScript provides many advantages in terms of code readability and maintainability, especially in large-scale projects.
TypeScript emphasizes type safety and type checking, and some type errors and potential runtime errors can be found at the compilation stage, thereby reducing the time and cost of code debugging and repair. In addition, TypeScript also provides many type features, such as interfaces, generics, enumerations, etc. These features can improve the readability and maintainability of the code, and at the same time reduce the writing of repeated code.
Of course, for beginners, learning TypeScript may feel a bit complicated at first, and it will take some time to get used to its syntax and features. However, once you master the basic usage of TypeScript, it can help us write more robust and readable code, and improve the quality and maintainability of the code. So, mastering TypeScript is worth it.
How can I quickly convert and adapt to this grammatical difference if I switch from ordinary javascript writing to typescript
Converting from ordinary JavaScript writing to TypeScript may require a certain adaptation process. Here are some tips that may help you quickly convert and adapt to this syntax difference:
Enable strict mode
In TypeScript, strict mode is enabled by default, which means you need more type annotations and type checking. If you are switching from JavaScript to TypeScript, you can first try to enable strict mode to adapt to TypeScript syntax more quickly. You can set "strict": true to true in tsconfig.json to enable all strict checking options.
Use type annotations
At the heart of TypeScript is the type system. In JavaScript, the type of a variable is determined dynamically at runtime. In TypeScript, the type of a variable is determined statically at compile time. This requires you to add type annotations to variables, functions, parameters, etc. You can start with simple type annotations and gradually adapt to TypeScript's syntax and type system.
use interface
In TypeScript, an interface can be used to describe the type of an object. If you are used to using JavaScript object literals to create objects, you can try to use interfaces to describe the type of object. Using interfaces can make your code more standardized, reduce code errors, and improve code readability and maintainability.
Use type aliases
Type aliases are a syntax feature of TypeScript that allow you to create aliases for complex types. If you often use object literals to represent complex data structures in JavaScript, you can try to use type aliases to create aliases for these complex types to make the code clearer and easier to read.
use generics
Generics is another syntax feature of TypeScript, which allows you to add type parameters to functions and classes to enhance the versatility and reusability of your code. If you often write generic functions and classes in JavaScript, you can try to use generics to enhance the type safety and generality of these functions and classes.
All in all, getting used to TypeScript's syntax takes time and effort. You can start with simple type annotations and interfaces and gradually adapt to TypeScript's type system and syntax features. At the same time, it is also very important to practice and try more.
Which variables need to be added after the type declaration in ts
In TypeScript, we can use type annotations to add type declarations to variables, functions, parameters, etc. Here are some situations where type declarations need to be added:
when declaring a variable
JavaScript
const name: string = 'Tom'
const age: number = 18
const isMale: boolean = true
const hobbies: string[] = ['swimming', 'reading', 'running']Function parameters and return values
JavaScript
function add(x: number, y: number): number {
return x + y
}
function sayHello(name: string): void {
console.log(`Hello, ${name}!`)
}
function findMax(numbers: number[]): number {
let max = numbers[0]
for (const num of numbers) {
if (num > max) {
max = num
}
}
return max
}properties of the object
JavaScript
interface Person {
name: string
age: number
isMale: boolean
hobbies: string[]
}
const tom: Person = {
name: 'Tom',
age: 18,
isMale: true,
hobbies: ['swimming', 'reading', 'running'],
}In conclusion, type annotations in TypeScript can be used anywhere a type declaration is required. When writing components using the composition API of Vue 3.x, we can also use type annotations to specify the type of the component to enhance the readability and maintainability of the code.
Will typescript eliminate javascript in the future? Do I have to learn TS?
Both TypeScript and JavaScript are currently very popular programming languages, and they both have their own application scenarios and advantages and disadvantages. TypeScript is a superset of JavaScript, which adds static type checking and some other features to JavaScript, which can improve the maintainability and robustness of the code.
Although TypeScript has advantages in some aspects, it will not completely replace JavaScript, because JavaScript is still one of the mainstream languages for web development, and it has a wide range of application scenarios and community support. At the same time, JavaScript has also added many new features after ES6, making its syntax more modern and easy to use, such as arrow functions, template strings, destructuring assignments, and so on.
Therefore, learning TypeScript is not necessary, but it is very useful if you want to use TypeScript in web development, or if you want to participate in some large front-end projects. In addition, TypeScript is also widely used in back-end development, mobile development and other fields, so it is also a language worth learning.
Original text link: Several questions about vue3.x and typescript that are often asked in teaching, unified answers_Technology sharing_Front end Lao Zhao
