If you compile ES6 code with Babel, and some class contains a static method, ES5-generated code will be just adding that static function to the constructor function.
So, this ES6 ES2015 code:
class A {
static doStuff() {}
}
...equals (in ES5):
function A() { }
A.doStuff = function() { };
Why you need static functions? Well, transpiled code won't support statics at all, since even functions are objects and static functions are turned into own properties of constructor function.
Static functions or properties can be used to implement factory pattern:
class A {
static create() {
// Specific factory method code
}
}
var instance = A.create();
Anyway, static member usage is a very diffuse topic and it goes out of scope of an objective answer. It has a lot of use cases and these are universal to any programming language.
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