carPriceNormalizer.mjs

carPriceNormalizer.mjs · 1.9 KiB · JavaScript Raw

#!/usr/bin/env node

const currentYear = new Date().getFullYear();

const adjustments = {
  exteriorColor: {
    black: 1000,
    blue: -500,
    burgundy: 500,
    charcoal: 500,
    deepBlue: 250,
    silver: 0,
    white: 250,
  },
  interiorColor: {
    dark: 0,
    light: 500,
    mixed: -250,
  },
  miles: [ 5000, 150 ],
  year: [ 1, 750 ],
};

const benchmark = {
  exteriorColor: 'silver',
  interiorColor: 'dark',
  miles: 100000,
  price: 10357,
  year: 2016,
};

const [ price, year, miles, exteriorColor, interiorColor ] = process.argv.slice(2);
// args list length
if (process.argv.slice(2).length !== 5) {
  throw new Error(`Expected exactly 5 args, found ${process.argv.slice(2).length}`);
}
// 1st 3 args should be numbers
[ price, year, miles ].forEach((number, i) => {
  if (isNaN(number)) {
    throw new Error(`arg #${number + 1} should be number`);
  }
});
// 4th arg should be enumerated
if (!Object.keys(adjustments.exteriorColor).includes(exteriorColor)) {
  throw new Error(`4th arg (exteriorColor) must be in list ${Object.keys(adjustments.exteriorColor).join(', ')}`);
}
// 5th arg should be enumerated
if (!Object.keys(adjustments.interiorColor).includes(interiorColor)) {
  throw new Error(`5th arg (interiorColor) must be in list ${Object.keys(adjustments.interiorColor).join(', ')}`);
}

const benchYearsOld = currentYear - benchmark.year;
const yearsOld = currentYear - Number(year);

function calcAdjustment (benchValue, value, [ quantifier, valueAdjustment ] = [ 1, 1 ]) {
  return (Number(value) - benchValue) / quantifier * valueAdjustment;
}

let adjustedPrice = Number(price);
adjustedPrice += calcAdjustment(benchmark.miles, miles, adjustments.miles);
adjustedPrice += calcAdjustment(benchYearsOld, yearsOld, adjustments.year);
adjustedPrice += calcAdjustment(0, adjustments.exteriorColor[exteriorColor]);
adjustedPrice += calcAdjustment(0, adjustments.interiorColor[interiorColor]);

console.log(adjustedPrice);

1	#!/usr/bin/env node
2
3	const currentYear = new Date().getFullYear();
4
5	const adjustments = {
6	exteriorColor: {
7	black: 1000,
8	blue: -500,
9	burgundy: 500,
10	charcoal: 500,
11	deepBlue: 250,
12	silver: 0,
13	white: 250,
14	},
15	interiorColor: {
16	dark: 0,
17	light: 500,
18	mixed: -250,
19	},
20	miles: [ 5000, 150 ],
21	year: [ 1, 750 ],
22	};
23
24	const benchmark = {
25	exteriorColor: 'silver',
26	interiorColor: 'dark',
27	miles: 100000,
28	price: 10357,
29	year: 2016,
30	};
31
32	const [ price, year, miles, exteriorColor, interiorColor ] = process.argv.slice(2);
33	// args list length
34	if (process.argv.slice(2).length !== 5) {
35	throw new Error(`Expected exactly 5 args, found ${process.argv.slice(2).length}`);
36	}
37	// 1st 3 args should be numbers
38	[ price, year, miles ].forEach((number, i) => {
39	if (isNaN(number)) {
40	throw new Error(`arg #${number + 1} should be number`);
41	}
42	});
43	// 4th arg should be enumerated
44	if (!Object.keys(adjustments.exteriorColor).includes(exteriorColor)) {
45	throw new Error(`4th arg (exteriorColor) must be in list ${Object.keys(adjustments.exteriorColor).join(', ')}`);
46	}
47	// 5th arg should be enumerated
48	if (!Object.keys(adjustments.interiorColor).includes(interiorColor)) {
49	throw new Error(`5th arg (interiorColor) must be in list ${Object.keys(adjustments.interiorColor).join(', ')}`);
50	}
51
52	const benchYearsOld = currentYear - benchmark.year;
53	const yearsOld = currentYear - Number(year);
54
55	function calcAdjustment (benchValue, value, [ quantifier, valueAdjustment ] = [ 1, 1 ]) {
56	return (Number(value) - benchValue) / quantifier * valueAdjustment;
57	}
58
59	let adjustedPrice = Number(price);
60	adjustedPrice += calcAdjustment(benchmark.miles, miles, adjustments.miles);
61	adjustedPrice += calcAdjustment(benchYearsOld, yearsOld, adjustments.year);
62	adjustedPrice += calcAdjustment(0, adjustments.exteriorColor[exteriorColor]);
63	adjustedPrice += calcAdjustment(0, adjustments.interiorColor[interiorColor]);
64
65	console.log(adjustedPrice);
66