"use strict";

const unreachable = require("./")("unreachable-demo");

function someFunction(ducksEaten) {
	let mapping = {
		1: "one",
		2: "two",
		3: "three"
	};

	let mappedValue = mapping[ducksEaten];

	if (mappedValue == null) {
		throw new Error(`Invalid value specified`);
	} else if (mappedValue === "one") {
		return "Only four little ducks came back";
	} else if (mappedValue === "two") {
		return "Only three little ducks came back";
	} else { // Oops, we forgot to add a case for "three"! Good thing we have a safety check here.
		unreachable(`Encountered unexpected mapped value '${mappedValue}'`);
	}
}

console.log(someFunction(1)); // Only four little ducks came back

console.log(someFunction(2)); // Only three little ducks came back

console.log(someFunction(3)); /*
	Error: Encountered unexpected mapped value 'three' -- this should never happen and it's a bug in 'unreachable-demo', please report it!
		at unreachable (/home/sven/projects/unreachable/index.js:5:9)
		at someFunction (/home/sven/projects/unreachable/example.js:21:3)
		at Object.<anonymous> (/home/sven/projects/unreachable/example.js:29:13)
		[ ... ]
*/