What is the reason for the absence of overloaded constructor implementations in TypeScript?

Why does TypeScript only allow overloading of constructor type signatures and not the Implementation? I find overloading constructors like in Java to be very useful. For instance, defining vectors with various combinations such as end coordinates, start and endpoint, or two vectors would be beneficial. The current approach in TypeScript appears chaotic in comparison. What is the reasoning behind TypeScript not having this feature?

Answer №1

A common issue in JavaScript is the inability to have multiple methods or members with the same name, unlike some other programming languages.

Let's take a look at an example in TypeScript:

class MyClass {
    myMethod() {}
    myMethod(str: string) {}
}

When compiled, the code looks like this:

var MyClass = (function () {
    function MyClass() {
    }
    MyClass.prototype.myMethod = function () { };
    MyClass.prototype.myMethod = function (str) { };
    return MyClass;
}());

In this scenario, the second definition of myMethod actually replaces the first one, causing issues with overloading methods in JavaScript.
To work around this limitation, you can only declare different method signatures and then provide a single implementation that satisfies all of them.

Answer №2

After submitting a problem report, I received the following verdict: Although it is technically feasible, implementing it would conflict with our design objectives. Appreciation to all who contributed to the conversation.

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