What sets class/instance methods apart from static methods when it comes to their functionality in applications?

As I develop APIs for my application, I've been curious about the difference between defining functionality methods like this:

class Foo {
  static method1(req, res) {}
  static method2(req, res) {}
}

and

class Foo {
  method1(req, res) {}
  method2(req, res) {}
}

I understand that static methods are attached directly to the class and cannot be called on instances of the class. They are typically used for creating utility functions. However, I am wondering if there are any disadvantages or effects of not using static when implementing functionalities in my application.

Answer №1

When the keyword static is not included, the method can only be called on an instance of the object.

If the keyword static is included, the method can only be accessed using the class name prefix, rather than an instance of the object.

If you have a method that could potentially be static (meaning it does not reference any instance data or use this to refer to an object instance), then you have the choice to make it either static or non-static. If you choose to make it non-static, it will still function correctly, but can only be called on an instance of the object itself or with a direct reference like Foo.prototype.method().

The downside of not declaring a static method as static is that it may not be as straightforward to use when you do not have an instance of the object available. This is where static methods come in handy - they allow you to declare and utilize functions within your class that do not require an instance to be instantiated.

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