TypeScript and JavaScript are both popular programming languages, and both are widely used in web development. While they have many similarities, there are also some notable differences between them. In this article, we will detail the differences between TypeScript and JavaScript.
1. Type system
TypeScript is a type-safe language that allows developers to specify the type of variables while writing code. This means developers can catch type errors at compile time, rather than discovering them at runtime. JavaScript, on the other hand, is a dynamically typed language, which allows variables to change their type dynamically at runtime.
Here is a TypeScript example:
let myString: string = "Hello, World!";
In this example, we explicitly specify the type of the myString variable as string. If we try to assign a number to this variable, the TypeScript compiler will complain.
Here is a JavaScript example:
js
let myString = "Hello, World!";
myString = 42;
In this example, we did not specify the type of the variable myString. We can initialize it to a string, but we can also change it to a number later. This flexibility is one of JavaScript's strengths, but it can also lead to type errors.
2. Compile
TypeScript needs to be compiled into JavaScript to run in a browser or Node.js environment. The compilation process converts TypeScript code into JavaScript code while performing type checking and other static analysis.
JavaScript, on the other hand, is an interpreted language and does not require a compilation process. JavaScript code can be run directly in the browser or in a Node.js environment.
3. Scalability
TypeScript is a superset of JavaScript, which contains all the features of JavaScript and adds some new features. These new features include type annotations, classes, interfaces, enumerations, and more. This makes TypeScript much richer and more extensible than JavaScript.
4. Learning curve
Since TypeScript has a type system and other new features, it can take some time to learn and get used to. JavaScript, on the other hand, is very easy to learn and even beginners can get started quickly.
To summarize, there are many differences between TypeScript and JavaScript. TypeScript is a type-safe language that requires a compilation process and has more extended features. JavaScript is a dynamically typed language that requires no compilation process and is very easy to learn. Which language you choose depends on your needs and preferences.
5.Relationship
Because javascript is an interpreted language and does not require compilation, there may be writing problems.
Therefore, typescript is designed according to the compiled language
and generates js code through compilation to ensure the security of the code.
Process:
write ts file---->compile through tsc---- ->Generate js file------>The file can be run directly in the browser