Discover how TypeScript enhances JavaScript by defining Built-In Types during the compilation process

When I first delved into the world of scripting languages, JavaScript felt manageable. However, things got confusing when I shifted my focus to Angular2 with TypeScript.

I soon discovered that TypeScript has the ability to define Built-In Types like string, number, and Objects, and when compiled, TypeScript transforms into JavaScript.

This is where my confusion set in - how does TypeScript handle Generic Types in a language like JavaScript, which relies on prototypes and lacks traditional Type definitions?

For instance, consider the challenge of translating the following code snippets into JavaScript:

interface Person {
   name : string,
   age : number
}

If anyone can shed light on this topic, I would greatly appreciate it. Scripting may be enjoyable, but it can also present some perplexing challenges at times. (^^)

Answer №1

Typescript is a supercharged version of JavaScript, laying down specific rules (such as generics and types) solely within the Typescript realm. It exclusively deals with generics at the TypeScript level, making them invisible in the resulting Javascript code.

Similarly, when you declare a variable using const in TypeScript, its value remains unchangeable at that level. However, in actual JavaScript, you have the freedom to modify it without restrictions.

In cases where const myVar is transformed into var myVar, especially if it's not ES6, showcasing the dynamic nature of JavaScript translation.

Explore this interactive tool for a direct comparison from TypeScript to JavaScript, giving insight into how your code evolves between different languages.

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