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blrobin2/a.js

Last active March 30, 2018 12:54
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a.js
const R = require("ramda");
const table = require("text-table");
const kelvinToCelcius = k => k - 273.15;
const kelvinToFahrenheit = k => k * 9 / 5 - 459.67;
const updateTemperature = R.curry((conversionFn, city) => {
const updatedTemperature = Math.round(conversionFn(city.temp));
return R.merge(city, { temp: updatedTemperature });
});
const groupByPropReducer = (acc, city) => {
const { cost = [], internetSpeed = [] } = acc;
return R.merge(acc, {
cost: R.append(city.cost, cost),
internetSpeed: R.append(city.internetSpeed, internetSpeed)
});
};
const percentile = (array, value) => {
const length = R.length(array);
const eqValue = R.equals(value);
const alen = !R.any(eqValue, array)
? R.range(0, length + 1)
: R.range(0, length);
const sortedArray = R.sort((a, b) => a - b, array);
const idx = R.map(eqValue, sortedArray);
const alenTrue = R.filter(v => idx[alen.indexOf(v)], alen);
return R.divide(R.mean(alenTrue), length);
};
const scoreCalculator = R.curry(
({ costScore, internetSpeedScore }, groupedByProp, city) => {
const { cost = 0, internetSpeed = 0 } = city;
const costPercentile = percentile(groupedByProp.cost, cost);
const internetSpeedPercentile = percentile(
groupedByProp.internetSpeed,
internetSpeed
);
const score =
costScore * (1.0 - costPercentile) +
internetSpeedScore * internetSpeedPercentile;
return R.merge(city, { score: Math.round(score) });
}
);
const scoreCities = R.curry(
({ costScore, internetSpeedScore }, scoreCalculator, cities) => {
const groupedByProps = R.reduce(groupByPropReducer, {}, cities);
return R.map(
scoreCalculator({ costScore, internetSpeedScore }, groupedByProps),
cities
);
}
);
const filterByWeather = R.curry(
({ minTemp, maxTemp, minHumidity, maxHumidity }, city) => {
const { temp = 0, humidity = 0 } = city;
return (
temp > minTemp &&
temp < maxTemp &&
humidity > minHumidity &&
humidity < maxHumidity
);
}
);
const cityToArray = city => {
const { name, country, score, cost, temp, internetSpeed } = city;
return [name, country, score, cost, temp, internetSpeed];
};
const interestingProps = [
"Name",
"Country",
"Score",
"Cost (in $)",
"Temp (in F)",
"Internet Speed"
];
const mapSortPropsToSortWithParams = R.map(R.compose(R.descend, R.prop));
const topCities = ({
minTemp,
maxTemp,
minHumidity,
maxHumidity,
costScore,
internetSpeedScore,
sortBy,
amountToDisplay
}) =>
R.pipe(
R.map(updateTemperature(kelvinToFahrenheit)),
R.filter(
filterByWeather({
minTemp,
maxTemp,
minHumidity,
maxHumidity
})
),
scoreCities(
{
costScore,
internetSpeedScore
},
scoreCalculator
),
R.sortWith(mapSortPropsToSortWithParams(sortBy)),
R.take(amountToDisplay),
R.map(cityToArray),
R.prepend(interestingProps),
table,
R.tap(console.log)
);
const myTopCities = topCities({
minTemp: 68,
maxTemp: 85,
minHumidity: 30,
maxHumidity: 70,
costScore: 100,
internetSpeedScore: 30,
sortBy: ["score", "cost"],
amountToDisplay: 10
});
myTopCities(require("./cities.json"));
Raw
cities.json
[
{
"name": "Bangkok",
"country": "TH",
"region": "SE Asia",
"cost": 1380,
"currency": "USD",
"temp": 302.03888888888895,
"humidity": 78,
"internetSpeed": 20
},
{
"name": "Chiang Mai",
"country": "TH",
"region": "SE Asia",
"cost": 654,
"currency": "USD",
"temp": 299.8166666666667,
"humidity": 83,
"internetSpeed": 20
},
{
"name": "Pattaya",
"country": "TH",
"region": "SE Asia",
"cost": 1183,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 88,
"internetSpeed": 20
},
{
"name": "Phuket",
"country": "TH",
"region": "SE Asia",
"cost": 1040,
"currency": "USD",
"temp": 302.03888888888895,
"humidity": 74,
"internetSpeed": 20
},
{
"name": "Hoi An",
"country": "VN",
"region": "SE Asia",
"cost": 1083,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 83,
"internetSpeed": 20
},
{
"name": "Prague",
"country": "CZ",
"region": "Europe",
"cost": 1191,
"currency": "USD",
"temp": 292.03888888888895,
"humidity": 77,
"internetSpeed": 40
},
{
"name": "Phnom Penh",
"country": "KH",
"region": "SE Asia",
"cost": 936,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 78,
"internetSpeed": 10
},
{
"name": "Sofia",
"country": "BG",
"region": "Europe",
"cost": 1490,
"currency": "USD",
"temp": 296.48333333333335,
"humidity": 69,
"internetSpeed": 40
},
{
"name": "Riga",
"country": "LV",
"region": "Europe",
"cost": 1417,
"currency": "USD",
"temp": 286.48333333333335,
"humidity": 82,
"internetSpeed": 40
},
{
"name": "Ho Chi Minh City",
"country": "VN",
"region": "SE Asia",
"cost": 1329,
"currency": "USD",
"temp": 296.48333333333335,
"humidity": 97,
"internetSpeed": 20
},
{
"name": "Penang",
"country": "MY",
"region": "SE Asia",
"cost": 1065,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 83,
"internetSpeed": 10
},
{
"name": "Budapest",
"country": "HU",
"region": "Europe",
"cost": 2166,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 53,
"internetSpeed": 30
},
{
"name": "Kuala Lumpur",
"country": "MY",
"region": "SE Asia",
"cost": 1206,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 83,
"internetSpeed": 10
},
{
"name": "Brasov",
"country": "RO",
"region": "Europe",
"cost": 1824,
"currency": "USD",
"temp": 294.2611111111112,
"humidity": 57,
"internetSpeed": 80
},
{
"name": "Bratislava",
"country": "SK",
"region": "Europe",
"cost": 1551,
"currency": "USD",
"temp": 294.2611111111112,
"humidity": 82,
"internetSpeed": 20
},
{
"name": "Kosice",
"country": "SK",
"region": "Europe",
"cost": 1466,
"currency": "USD",
"temp": 292.03888888888895,
"humidity": 72,
"internetSpeed": 30
},
{
"name": "Belgrade",
"country": "RS",
"region": "Europe",
"cost": 1358,
"currency": "USD",
"temp": 293.15000000000003,
"humidity": 93,
"internetSpeed": 10
},
{
"name": "Wroclaw",
"country": "PL",
"region": "Europe",
"cost": 1764,
"currency": "USD",
"temp": 294.2611111111112,
"humidity": 68,
"internetSpeed": 20
},
{
"name": "Davao",
"country": "PH",
"region": "SE Asia",
"cost": 1054,
"currency": "USD",
"temp": 294.8166666666667,
"humidity": 100,
"internetSpeed": 5
},
{
"name": "Timisoara",
"country": "RO",
"region": "Europe",
"cost": 1999,
"currency": "USD",
"temp": 294.2611111111112,
"humidity": 94,
"internetSpeed": 60
},
{
"name": "Ubud",
"country": "ID",
"region": "SE Asia",
"cost": 1185,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 83,
"internetSpeed": 5
},
{
"name": "Ljubljana",
"country": "SI",
"region": "Europe",
"cost": 2162,
"currency": "USD",
"temp": 293.15000000000003,
"humidity": 77,
"internetSpeed": 20
},
{
"name": "Warsaw",
"country": "PL",
"region": "Europe",
"cost": 1987,
"currency": "USD",
"temp": 291.48333333333335,
"humidity": 63,
"internetSpeed": 30
},
{
"name": "Zagreb",
"country": "HR",
"region": "Europe",
"cost": 1539,
"currency": "USD",
"temp": 295.37222222222226,
"humidity": 82,
"internetSpeed": 10
},
{
"name": "Shanghai",
"country": "CN",
"region": "East Asia",
"cost": 1656,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 83,
"internetSpeed": 20
},
{
"name": "San Juan",
"country": "US",
"region": "Central America",
"cost": 2164,
"currency": "USD",
"temp": 297.03888888888895,
"humidity": 94,
"internetSpeed": 10
},
{
"name": "Cochabamba",
"country": "BO",
"region": "South America",
"cost": 829,
"currency": "USD",
"temp": 297.03888888888895,
"humidity": 25,
"internetSpeed": 5
},
{
"name": "Taipei",
"country": "TW",
"region": "East Asia",
"cost": 2137,
"currency": "USD",
"temp": 304.8166666666667,
"humidity": 69,
"internetSpeed": 40
},
{
"name": "Montreal",
"country": "CA",
"region": "North America",
"cost": 2305,
"currency": "USD",
"temp": 297.5944444444445,
"humidity": 57,
"internetSpeed": 20
},
{
"name": "Las Vegas",
"country": "US",
"region": "North America",
"cost": 2148,
"currency": "USD",
"temp": 307.5944444444445,
"humidity": 20,
"internetSpeed": 40
},
{
"name": "Lima",
"country": "PE",
"region": "South America",
"cost": 1099,
"currency": "USD",
"temp": 292.03888888888895,
"humidity": 72,
"internetSpeed": 10
},
{
"name": "Curitiba",
"country": "BR",
"region": "South America",
"cost": 2145,
"currency": "USD",
"temp": 299.8166666666667,
"humidity": 60,
"internetSpeed": 30
},
{
"name": "Siem Reap",
"country": "KH",
"region": "SE Asia",
"cost": 1045,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 78,
"internetSpeed": 10
},
{
"name": "Austin",
"country": "US",
"region": "North America",
"cost": 2541,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 73,
"internetSpeed": 60
},
{
"name": "Beijing",
"country": "CN",
"region": "East Asia",
"cost": 1565,
"currency": "USD",
"temp": 300.9277777777778,
"humidity": 93,
"internetSpeed": 30
},
{
"name": "Cairo",
"country": "EG",
"region": "Africa",
"cost": 917,
"currency": "USD",
"temp": 305.37222222222226,
"humidity": 38,
"internetSpeed": 5
},
{
"name": "Dallas",
"country": "US",
"region": "North America",
"cost": 2265,
"currency": "USD",
"temp": 306.48333333333335,
"humidity": 55,
"internetSpeed": 20
},
{
"name": "Park City",
"country": "US",
"region": "North America",
"cost": 2862,
"currency": "USD",
"temp": 302.03888888888895,
"humidity": 21,
"internetSpeed": 40
},
{
"name": "Lisbon",
"country": "PT",
"region": "Europe",
"cost": 2455,
"currency": "USD",
"temp": 300.37222222222226,
"humidity": 64,
"internetSpeed": 30
},
{
"name": "Santa Monica",
"country": "US",
"region": "North America",
"cost": 2601,
"currency": "USD",
"temp": 302.03888888888895,
"humidity": 69,
"internetSpeed": 40
},
{
"name": "Singapore",
"country": "SG",
"region": "SE Asia",
"cost": 2678,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 94,
"internetSpeed": 80
},
{
"name": "Medellin",
"country": "CO",
"region": "South America",
"cost": 1296,
"currency": "USD",
"temp": 294.2611111111112,
"humidity": 52,
"internetSpeed": 10
},
{
"name": "Toronto",
"country": "CA",
"region": "North America",
"cost": 2825,
"currency": "USD",
"temp": 300.37222222222226,
"humidity": 69,
"internetSpeed": 20
},
{
"name": "Tokyo",
"country": "JP",
"region": "East Asia",
"cost": 2392,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 83,
"internetSpeed": 30
},
{
"name": "Porto",
"country": "PT",
"region": "Europe",
"cost": 2686,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 99,
"internetSpeed": 30
},
{
"name": "Tucson",
"country": "US",
"region": "North America",
"cost": 2882,
"currency": "USD",
"temp": 309.8166666666667,
"humidity": 31,
"internetSpeed": 30
},
{
"name": "Palawan",
"country": "PH",
"region": "SE Asia",
"cost": 1255,
"currency": "USD",
"temp": 295.9277777777778,
"humidity": 96,
"internetSpeed": 5
},
{
"name": "Hong Kong",
"country": "HK",
"region": "East Asia",
"cost": 2634,
"currency": "USD",
"temp": 304.8166666666667,
"humidity": 79,
"internetSpeed": 90
},
{
"name": "Playa del Carmen",
"country": "MX",
"region": "North America",
"cost": 1887,
"currency": "USD",
"temp": 303.7055555555556,
"humidity": 70,
"internetSpeed": 10
},
{
"name": "Manchester",
"country": "UK",
"region": "Europe",
"cost": 2641,
"currency": "USD",
"temp": 294.2611111111112,
"humidity": 64,
"internetSpeed": 30
},
{
"name": "Tel Aviv",
"country": "IL",
"region": "Europe",
"cost": 2519,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 61,
"internetSpeed": 20
},
{
"name": "Bucharest",
"country": "RO",
"region": "Europe",
"cost": 2064,
"currency": "USD",
"temp": 295.37222222222226,
"humidity": 77,
"internetSpeed": 80
},
{
"name": "Vancouver",
"country": "CA",
"region": "North America",
"cost": 2843,
"currency": "USD",
"temp": 292.5944444444445,
"humidity": 87,
"internetSpeed": 40
},
{
"name": "Bordeaux",
"country": "FR",
"region": "Europe",
"cost": 3077,
"currency": "USD",
"temp": 300.9277777777778,
"humidity": 36,
"internetSpeed": 30
},
{
"name": "Buenos Aires",
"country": "AR",
"region": "South America",
"cost": 1724,
"currency": "USD",
"temp": 291.48333333333335,
"humidity": 88,
"internetSpeed": 10
},
{
"name": "Detroit",
"country": "US",
"region": "North America",
"cost": 2301,
"currency": "USD",
"temp": 300.37222222222226,
"humidity": 44,
"internetSpeed": 30
},
{
"name": "Seoul",
"country": "KR",
"region": "East Asia",
"cost": 2934,
"currency": "USD",
"temp": 293.15000000000003,
"humidity": 82,
"internetSpeed": 60
},
{
"name": "Cebu",
"country": "PH",
"region": "SE Asia",
"cost": 1808,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 88,
"internetSpeed": 5
},
{
"name": "Tallinn",
"country": "EE",
"region": "Europe",
"cost": 3161,
"currency": "USD",
"temp": 289.2611111111112,
"humidity": 82,
"internetSpeed": 40
},
{
"name": "Boulder",
"country": "US",
"region": "North America",
"cost": 3070,
"currency": "USD",
"temp": 307.5944444444445,
"humidity": 20,
"internetSpeed": 20
},
{
"name": "Salzburg",
"country": "AT",
"region": "Europe",
"cost": 2748,
"currency": "USD",
"temp": 290.9277777777778,
"humidity": 82,
"internetSpeed": 20
},
{
"name": "Madrid",
"country": "ES",
"region": "Europe",
"cost": 2798,
"currency": "USD",
"temp": 308.15000000000003,
"humidity": 17,
"internetSpeed": 30
},
{
"name": "Vienna",
"country": "AT",
"region": "Europe",
"cost": 3096,
"currency": "USD",
"temp": 292.5944444444445,
"humidity": 82,
"internetSpeed": 20
},
{
"name": "Manila",
"country": "PH",
"region": "SE Asia",
"cost": 1371,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 100,
"internetSpeed": 5
},
{
"name": "Dubai",
"country": "AE",
"region": "Middle East",
"cost": 3233,
"currency": "USD",
"temp": 309.2611111111112,
"humidity": 37,
"internetSpeed": 30
},
{
"name": "Recife",
"country": "BR",
"region": "South America",
"cost": 1994,
"currency": "USD",
"temp": 299.2611111111112,
"humidity": 97,
"internetSpeed": 20
},
{
"name": "Saint Petersburg",
"country": "RU",
"region": "Europe",
"cost": 2124,
"currency": "USD",
"temp": 289.2611111111112,
"humidity": 63,
"internetSpeed": 20
},
{
"name": "Orlando",
"country": "US",
"region": "North America",
"cost": 2436,
"currency": "USD",
"temp": 306.48333333333335,
"humidity": 55,
"internetSpeed": 20
},
{
"name": "Seattle",
"country": "US",
"region": "North America",
"cost": 3254,
"currency": "USD",
"temp": 292.03888888888895,
"humidity": 72,
"internetSpeed": 30
},
{
"name": "Salt Lake City",
"country": "US",
"region": "North America",
"cost": 3729,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 20,
"internetSpeed": 30
},
{
"name": "Berlin",
"country": "DE",
"region": "Europe",
"cost": 3508,
"currency": "USD",
"temp": 293.7055555555556,
"humidity": 49,
"internetSpeed": 30
},
{
"name": "Wellington",
"country": "NZ",
"region": "Oceania",
"cost": 3539,
"currency": "USD",
"temp": 284.2611111111111,
"humidity": 87,
"internetSpeed": 30
},
{
"name": "Cambridge",
"country": "UK",
"region": "Europe",
"cost": 3270,
"currency": "USD",
"temp": 295.37222222222226,
"humidity": 49,
"internetSpeed": 30
},
{
"name": "Portland",
"country": "US",
"region": "North America",
"cost": 3266,
"currency": "USD",
"temp": 289.8166666666667,
"humidity": 62,
"internetSpeed": 20
},
{
"name": "Granada",
"country": "ES",
"region": "Europe",
"cost": 2855,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 25,
"internetSpeed": 30
},
{
"name": "Barcelona",
"country": "ES",
"region": "Europe",
"cost": 3431,
"currency": "USD",
"temp": 298.15000000000003,
"humidity": 60,
"internetSpeed": 30
},
{
"name": "Dublin",
"country": "IE",
"region": "Europe",
"cost": 3214,
"currency": "USD",
"temp": 290.37222222222226,
"humidity": 82,
"internetSpeed": 30
},
{
"name": "Auckland",
"country": "NZ",
"region": "Oceania",
"cost": 2869,
"currency": "USD",
"temp": 284.8166666666667,
"humidity": 100,
"internetSpeed": 20
},
{
"name": "Stockholm",
"country": "SE",
"region": "Europe",
"cost": 3714,
"currency": "USD",
"temp": 295.37222222222226,
"humidity": 68,
"internetSpeed": 50
},
{
"name": "Denver",
"country": "US",
"region": "North America",
"cost": 3229,
"currency": "USD",
"temp": 307.5944444444445,
"humidity": 20,
"internetSpeed": 30
},
{
"name": "Basel",
"country": "CH",
"region": "Europe",
"cost": 3795,
"currency": "USD",
"temp": 291.48333333333335,
"humidity": 82,
"internetSpeed": 40
},
{
"name": "Amsterdam",
"country": "NL",
"region": "Europe",
"cost": 3772,
"currency": "USD",
"temp": 293.7055555555556,
"humidity": 68,
"internetSpeed": 40
},
{
"name": "Johannesburg",
"country": "ZA",
"region": "Africa",
"cost": 2072,
"currency": "USD",
"temp": 293.15000000000003,
"humidity": 12,
"internetSpeed": 10
},
{
"name": "Lyon",
"country": "FR",
"region": "Europe",
"cost": 3680,
"currency": "USD",
"temp": 295.37222222222226,
"humidity": 49,
"internetSpeed": 50
},
{
"name": "Rome",
"country": "IT",
"region": "Europe",
"cost": 3250,
"currency": "USD",
"temp": 297.03888888888895,
"humidity": 88,
"internetSpeed": 10
},
{
"name": "Copenhagen",
"country": "DK",
"region": "Europe",
"cost": 3514,
"currency": "USD",
"temp": 292.03888888888895,
"humidity": 77,
"internetSpeed": 40
},
{
"name": "Los Angeles",
"country": "US",
"region": "North America",
"cost": 4178,
"currency": "USD",
"temp": 301.48333333333335,
"humidity": 73,
"internetSpeed": 30
},
{
"name": "Cape Town",
"country": "ZA",
"region": "Africa",
"cost": 2564,
"currency": "USD",
"temp": 288.7055555555556,
"humidity": 84,
"internetSpeed": 10
},
{
"name": "Rotterdam",
"country": "NL",
"region": "Europe",
"cost": 3736,
"currency": "USD",
"temp": 293.15000000000003,
"humidity": 63,
"internetSpeed": 50
},
{
"name": "Oslo",
"country": "NO",
"region": "Europe",
"cost": 4294,
"currency": "USD",
"temp": 293.15000000000003,
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{
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{
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},
{
"name": "Minneapolis",
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{
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{
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{
"name": "Paris",
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},
{
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{
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{
"name": "London",
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}
]
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