Enumerations

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Enums1.js

#!/usr/bin/env node;
const Utils = require('./Utils');

const CompassPoint = Object.freeze({
	NORTH: 0,
	EAST: 1,
	SOUTH: 2,
	WEST: 3
});

function compassPointToString(c) {
	let result = "";
	switch (c) {
		case CompassPoint.NORTH:
			result = "North";
			break;
		case CompassPoint.EAST:
			result = "East";
			break;
		case CompassPoint.SOUTH:
			result = "South";
			break;
		case CompassPoint.WEST:
			result = "West";
			break;
	}
	return result;
}

function turnRight(c) {
	if (c === CompassPoint.NORTH) {
		return CompassPoint.EAST;
	} else if (c === CompassPoint.EAST) {
		return CompassPoint.SOUTH;
	} else if (c === CompassPoint.SOUTH) {
		return CompassPoint.WEST;
	} else {
		return CompassPoint.NORTH;
	}
}

const main = async () => {
	let cp1 = CompassPoint.NORTH;
	console.log(["cp1: ", Utils.intToEnum(CompassPoint, cp1)].join(''));
	console.log(["SOUTH: ", compassPointToString(CompassPoint.SOUTH)].join(''));
	console.log(["turnRight(cp1): ", compassPointToString(turnRight(cp1))].join(''));
	const CP2 = CompassPoint.EAST;
	if (cp1 === CP2) {
		console.log("cp1 == cp2");
	} else {
		console.log("cp1 != cp2");
	}
	cp1 = CP2;
	if (cp1 === CP2) {
		console.log("cp1 == cp2");
	} else {
		console.log("cp1 != cp2");
	}
}
main().catch( e => { console.error(e) } );

Enums2.js

#!/usr/bin/env node;
const Utils = require('./Utils');

const Color = Object.freeze({
	RED: 1,
	GREEN: 2,
	YELLOW: 3,
	BLUE: 4,
	MAGENTA: 5,
	CYAN: 6
});

function combineColors(c1, c2) {
	const i1 = c1;
	const i2 = c2;
	const RESULT = i1 | i2;
	const RETURN_COLOR = RESULT;
	return RETURN_COLOR;
}

const main = async () => {
	let c1 = Color.BLUE;
	console.log(["c1: ", Utils.intToEnum(Color, c1)].join(''));
	console.log(["RED: ", Utils.intToEnum(Color, Color.RED)].join(''));
	console.log(["combineColors(c1, RED): ", Utils.intToEnum(Color, combineColors(c1, Color.RED))].join(''));
	const c2 = Color.GREEN;
	console.log(["combineColors(c1, c2): ", Utils.intToEnum(Color, combineColors(c1, c2))].join(''));
	if (c1 === c2) {
		console.log("c1 == c2");
	} else {
		console.log("c1 != c2");
	}
	c1 = c2;
	if (c1 === c2) {
		console.log("c1 == c2");
	} else {
		console.log("c1 != c2");
	}
	const BAD = 7;
	console.log(["bad: ", Utils.intToEnum(Color, BAD)].join(''));
}
main().catch( e => { console.error(e) } );

Questions

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References

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