TypeScript

TypeScript is JavaScript with syntax for types.

TypeScript is a strongly typed programming language which builds on JavaScript giving you better tooling at any scale.

→ typescriptlang.org, GitHub

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Quickstart

5 minutes tutorial

  • TypeScript must be known globally on your machine: npm install -g typescript

  • Create a new folder and initiate TypeScript configuration: tsc --init

    • Review the fille name tsconfig.json that has been generated

  • Create a file named greeter.ts

    class Student {
    fullName: string;
    constructor(public firstName: string, public middleInitial: string, public lastName: string) {
        this.fullName = firstName + " " + middleInitial + " " + lastName;
    }
}

interface Person {
    firstName: string;
    lastName: string;
}

function greeter(person : Person) {
    return "Hello, " + person.firstName + " " + person.lastName;
}

let user = new Student("Jane", "M.", "User");

document.body.innerHTML = greeter(user);

  • Run the compiler: tsc

    • Review the generated file greeter.js

    • You can also have the compiler run with the watch option: tsc --watch

  • Create a greeter.html file and open the file in a browser:

    <!DOCTYPE html>
<html>
    <head><title>TypeScript Greeter</title></head>
    <body>
        <script src="greeter.js"></script>
    </body>
</html>
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