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What is the depth comparison between TypeScript and JavaScript? I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

TypeScript and JavaScript are two popular scripting languages in project development. We already know that TypeScript is a superset of JavaScript, but what is the difference between TypeScript and JavaScript? When choosing a development language, how do you choose?

Make an in-depth comparison of the two languages, discuss the connections and differences between the two languages, and summarize the respective advantages of the two languages.

An overview of JavaScript and TypeScript

JavaScript

JavaScript is a lightweight interpretive scripting language that can be embedded in HTML pages and executed on the browser side. It can achieve rich interactive functions on the browser side and bring users a smooth and diverse user experience.

JavaScript is object-based and event-driven, does not require a specific locale, and can be run on a supported browser.

The JavaScript language has the following characteristics:

JavaScript is a scripting language that does not need to be compiled. As long as it is embedded in HTML code, it can be loaded and interpreted by the browser line by line.

JavaScript is an object-based language that allows you to create objects while using existing objects. However, Javascript does not support the inheritance and overloading capabilities of other object-oriented languages.

The syntax of JavaScript is simple and the variables used are weakly typed.

JavaScript language is relatively secure, only executes on the browser side, and does not access local hard disk data.

JavaScript language is dynamic. JavaScript is event-driven and only responds to the user's actions.

JavaScript depends only on browsers and has nothing to do with operating system factors. Therefore, JavaScript is a cross-platform language.

JavaScript is compatible and can be used with other technologies such as XML,REST API.

TypeScript

TypeScript is an object-oriented programming language developed and maintained by Microsoft. It is a superset of JavaScript, contains all the elements of JavaScript, can be loaded into JavaScript code to run, and extends the syntax of JavaScript.

TypeScript has the following characteristics:

TypeScript is an open source language released by Microsoft and uses the Apache licensing protocol.

TypeScript adds static types, classes, modules, interfaces and type annotations

TypeScript can be used to develop large-scale applications

TypeScript is easy to learn and easy to understand

Main differences between JavaScript and TypeScript

TypeScript can use all the code and coding concepts in JavaScript, and TypeScript was created to make JavaScript development easier. For example, TypeScript uses concepts such as types and interfaces to describe the data being used, which enables developers to quickly detect errors and debug applications

TypeScript extends the JavaScript object model in terms of the core language and the modeling of class concepts.

JavaScript code can work with TypeScript without any modification, and a compiler can be used to convert TypeScript code to JavaScript.

TypeScript provides static type checking at compile time through type annotations.

Data in TypeScript is required to be explicitly typed, but not required by JavaScript.

TypeScript provides default parameter values for the function.

TypeScript introduces the concept of "classes" that are not available in JavaScript.

The concept of modules is introduced in TypeScript, where declarations, data, functions, and classes can be encapsulated in modules.

Advantages of TypeScript

Here is a list of the significant advantages of TypeScript over JavaScript:

1. Static input

Static typing is a feature that detects errors when developers write scripts. Finding and fixing bugs is an urgent need for today's development teams. With this feature, developers are allowed to write and maintain more robust code to make the code better and clearer.

two。 Large-scale development project

Sometimes you need to make small incremental changes to the code base in order to improve the development project. These small changes can have serious and unintended consequences, so it is necessary to undo them. It is easier and faster to use TypeScript tools for refactoring.

3. Better collaboration

When a large project is launched, there will be many developers, and the number of garbled and wrong machines will increase. Type safety is a feature that detects errors during coding, rather than when a project is compiled. This creates a more efficient coding and debugging process for the development team.

4. Greater productivity

Factors such as clean ECMAScript 6 code, automatic completion and dynamic input help to improve the productivity of developers. These features also help the compiler create optimized code.

Advantages of JavaScript

There are also some obvious advantages over TypeScript,JavaScript.

1. Popularity

JavaScript's developer community is still huge and active, and a large number of mature development projects and available resources can be easily found in the community.

two。 Learning curve

Due to the early and mature development of the JavaScript language, there are still a large number of developers who insist on using their familiar scripting language JavaScript instead of learning TypeScript.

3. Local browser support

The TypeScript code needs to be compiled (output JavaScript code), which is an additional step in the execution of the TypeScript code.

4. No comments required

In order to take full advantage of TypeScript features, developers need to constantly comment their code, which may make the project less efficient.

5. Flexibility

Some developers prefer the flexibility of JavaScript.

How to choose

TypeScript is becoming a powerful tool for developing large-scale coding projects. Because the structure of its object-oriented programming language keeps the code clean, consistent and simple debugging. Therefore, TypeScript is more appropriate when dealing with large development projects. If you have a relatively small coding project, it doesn't seem necessary to use TypeScript, just use a flexible JavaScript.

After reading the above, have you mastered the method of deep comparison between TypeScript and JavaScript? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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