ECMAScript Class Enum Block

example.js

class Color {
	enum {
		RED(0xff0000),
		GREEN(0x00ff00),
		BLUE(0x0000ff) 
	}
	constructor(hex) {
		hex %= 0x1000000;
		this.red = hex >> 0x10;
		this.green = (hex >> 0x8) % 0x100;
		this.blue = hex % 0x100;
	}
	toString() {
		return (this.red * 0x10000 + this.green * 0x100 + this.blue).toString(16);
	}
}

// Without enum syntax...
class Color {
	static RED = new Color(0xff0000);
	static GREEN = new Color(0x00ff00);
	static BLUE = new Color(0x0000ff);
	constructor(hex) {
		hex %= 0x1000000;
		this.red = hex >> 0x10;
		this.green = (hex >> 0x8) % 0x100;
		this.blue = hex % 0x100;
	}
	toString() {
		return (this.red * 0x10000 + this.green * 0x100 + this.blue).toString(16);
	}
}

// Roughly equivalent to...

function Color(hex) {
	hex %= 0x1000000;
	this.red = hex >> 0x10;
	this.green = (hex >> 0x8) % 0x100;
	this.blue = hex % 0x100;
}
Color.prototype.toString = function() {
	return (this.red * 0x10000 + this.green * 0x100 + this.blue).toString(16);
}
Color.RED = new Color(0xff0000);
Color.GREEN = new Color(0x00ff00);
Color.BLUE = new Color(0x0000ff);

example2.js

class Day {
	enum {
		Mon('Monday'),
		Tue('Tuesday),
		Wed('Wednesday'),
		Thu('Thursday'),
		Fri('Friday'),
		Sat('Saturday'),
		Sun('Sunday')
	}
	static _days = [];
	static byIndex(index) {
		return Day._days[index];
	}
	constructor(name) {
		this.name = name;
		Day._days.push(this);
	}
}

function isWeekend(day) {
	switch(day) {
		case Day.Sat:
		case Day.Sun:
			return true;
		default:
			return false;
	}
}

function logTheDay() {
	const today = (new Date).getDay();
	console.log(`Today is a ${Day.byIndex(today).name}`);
}