Classes

First Let Us Look At 'this'

The keyword this used inside a static method refers to the class (not an object instance).

class Play {
	static meStaticMethod() {
		prn(this===Play);
		//prints true
	}
}

Coding a Static Variable

Here we see how to code a static variable named "Foo" with static getter "getFoo".

We use the nullish coalescing operator. The logical OR operator is another option but not as reliable (play with "0 || 10" in a lab).

class Play {
	static getFoo() {
		return this.Foo ?? (this.Foo = 'Me Static!!');
	}
}

console.log(Play.getFoo());
//prints 'Me Static!!'

Or Like This

Using an old-fashioned if statement

class Play {
	static getFoo() {
		if (!this.Foo)
			this.Foo = 'Me Static';
		return this.Foo;
	}
}

console.log(Play.getFoo());
//prints 'Me Static'