Exploring the Features of TypeScript

Typescript is known for its comprehensive and flexible features that provide immense benefits to developers. Some of these worth mentioning features are:

Compilation to All Major Versions of Javascript

One of the key features of Typescript is that it can be compiled to all major versions of Javascript, namely ES3, ES5, ES6, ES7, and others. This means the Typescript files, usually with the .ts extension, can be transpiled into Javascript files which can be run by browsers.

For example, using the Typescript Compiler, a developer can transpile a sample Typescript code,

let message: string = "Hello, World!" 
console.log(message) 

Into the equivalent Javascript code.

var message = "Hello, World!";
console.log(message);

The ability to compile to all significant versions of Javascript allows for greater compatibility and flexibility in building applications.

Cross-Browser Development

Typescript is commonly used for cross-browser development as it is an open-source project supported by Microsoft. You can confidently code in Typescript knowing that your code will be executed correctly across different types of web browsers, whether it's Chrome, Firefox, Safari, or others. This feature ensures a seamless and accessible experience for all users, regardless of their browser preference.

Superset of JavaScript

Typescript is considered a superset of Javascript, providing a typed nature to the code. This means Typescript includes all features of Javascript, plus additional ones that make code writing more accessible and safer. These added features include type checking, interfaces, classes, modules, among others.

Having typed code brings about various benefits. For instance, it reduces bugs and errors as the types of variables are checked at compile-time. It also provides better autocompletion, navigation, and refactoring services, leading to enhanced productivity.

function greet(name: string) {
    console.log(`Hello, ${name}`);
}

greet('John'); // Correct usage
greet(123); // Error: Argument of type 'number' is not assignable to parameter of type 'string'

In conclusion, all the above-discussed points are the features of Typescript which make it an attractive option for developers. Hence, the statement "All of the above" is the correct answer in the context of the given question. Using Typescript ensures a smooth, efficient, and error-free coding experience.