What are the downsides of utilizing a global function over a private static method in Typescript?

It's quite frustrating to have to write this.myMethod() or ClassName.myMethod() instead of just myMethod(). Especially when dealing with a stateless utility function that doesn't need direct access to fields.

Take a look at this example:

function method1() { }

class App {
    main() {
        method1(); // I wish I could just use this
        App.method2();
    }

    private static method2() { 
        // Stateless and doesn't require field access
    }
}

I often ponder whether using a global function instead of a private static method (or vice versa) would be more beneficial. Any insights on this issue?

Answer №1

There are numerous reasons to avoid using global methods.

Firstly, there is the issue of typing. Method types are already associated with a specific class or instance. To type a global function, you would need to overwrite the entire global module as well.

Secondly, there is the risk of name collisions. It is quite easy to accidentally overwrite one global method with another. In the case of class methods, you can assign unique names to private methods within classes like method, ensuring no conflicts occur.

Thirdly, in a global function, you cannot use this to refer to a class instance.

Lastly, there may be some impact on speed (though the exact amount is unknown). Private methods operate at a basic scope level, while global methods are positioned at the topmost level. Therefore, when running, V8 runtime must check each scope between 'this' and the global scope.

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