Fundamentally, can the "this" keyword be the same in C# vs Javascript

I am getting into a fundamental argument about strongly typed, and statically typed languages. The other debater is a pure javascript enthusiast. While I enjoy working with both c# and javascript. The conversation arose over the discussion about TypeScript and how it’s better than pure js because it is strongly typed. (subjective already). So I provided him with an argument that TypeScript already fails at what it is attempting to do with the following example.

class Greeter {
    greeting: string;
    constructor(message: string) {
        this.greeting = message;
    greet() {
        return "Hello, " + this.greeting;

var greeter = new Greeter("world");
var greetWorld = greeter.greet;
alert(greetWorld()); //undefined, unexpected for strongly typed languages

I have already said this is expected in JS. In fact, I love this. This is why it being a dynamically typed language is so powerful. But, the ‘this’ keyword is nothing more than a property in JS and why TypeScript is just an additional layer adding to confusion and making it no better.

“When a function is created, a keyword called this is created (behind the scenes), which links to the object in which the function operates.”(JS).

Well this is truly just a property of the function/object then. The definition of strongly typed: ” each type of data (such as integer, character, hexadecimal, packed decimal, and so forth) is predefined as part of the programming language and all constants or variables defined for a given program must be described with one of the data types.” So the data-type function/object are separate, keyword “ONE” of the data types.

I just can’t seem to drive the argument home. In fact, I might even be wrong. To me though, the problem above is a runtime type error, that their is no greeting even though it should be expected if the ‘this’ keyword were truly bound in the programming language.

Am I missing something?

139 thoughts on “Fundamentally, can the "this" keyword be the same in C# vs Javascript”

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