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111 lines
2.7 KiB
Markdown
111 lines
2.7 KiB
Markdown
---
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id: 6a0dcd03ee4e68698080ef66
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title: "Challenge 302: Jet Lagged"
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challengeType: 28
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dashedName: challenge-302
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---
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# --description--
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Given a departure city, an arrival city, a flight duration in hours, and a direction of travel, return the number of jet lag hours the traveller is experiencing.
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The given cities will be from the following list that includes their UTC offset:
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| City | Offset |
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| - | - |
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| `"Los Angeles"` | -8 |
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| `"New York"` | -5 |
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| `"London"` | 0 |
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| `"Istanbul"` | +3 |
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| `"Dubai"` | +4 |
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| `"Hong Kong"` | +8 |
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| `"Tokyo"` | +9 |
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To calculate jet lag hours:
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1. Find the timezone difference in hours between the two cities.
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2. Determine the direction multiplier. If travelling `"east"`, it's 1.5, otherwise, it's 1.0.
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3. Get the jet lag hours with the formula: timezone difference + (flight duration * 0.1) * direction multiplier
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Return the jet lag hours rounded to one decimal place.
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# --hints--
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`getJetLagHours("Istanbul", "Hong Kong", 10, "east")` should return `6.5`.
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```js
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assert.equal(getJetLagHours("Istanbul", "Hong Kong", 10, "east"), 6.5);
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```
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`getJetLagHours("London", "New York", 8, "west")` should return `5.8`.
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```js
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assert.equal(getJetLagHours("London", "New York", 8, "west"), 5.8);
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```
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`getJetLagHours("Hong Kong", "Tokyo", 4, "east")` should return `1.6`.
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```js
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assert.equal(getJetLagHours("Hong Kong", "Tokyo", 4, "east"), 1.6);
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```
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`getJetLagHours("Dubai", "London", 7, "west")` should return `4.7`.
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```js
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assert.equal(getJetLagHours("Dubai", "London", 7, "west"), 4.7);
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```
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`getJetLagHours("Los Angeles", "Hong Kong", 15, "west")` should return `17.5`.
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```js
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assert.equal(getJetLagHours("Los Angeles", "Hong Kong", 15, "west"), 17.5);
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```
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`getJetLagHours("Tokyo", "Dubai", 9, "west")` should return `5.9`.
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```js
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assert.equal(getJetLagHours("Tokyo", "Dubai", 9, "west"), 5.9);
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```
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`getJetLagHours("New York", "Istanbul", 10, "east")` should return `9.5`.
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```js
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assert.equal(getJetLagHours("New York", "Istanbul", 10, "east"), 9.5);
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```
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# --seed--
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## --seed-contents--
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```js
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function getJetLagHours(departureCity, arrivalCity, flightDuration, direction) {
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return departureCity;
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}
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```
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# --solutions--
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```js
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function getJetLagHours(departureCity, arrivalCity, flightDuration, direction) {
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const offsets = {
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"Los Angeles": -8,
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"New York": -5,
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"London": 0,
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"Istanbul": +3,
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"Dubai": +4,
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"Hong Kong": +8,
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"Tokyo": +9
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};
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const depOffset = offsets[departureCity];
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const arrOffset = offsets[arrivalCity];
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const timezoneDiff = Math.abs(arrOffset - depOffset);
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const multiplier = direction === "east" ? 1.5 : 1.0;
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const score = timezoneDiff + (flightDuration * 0.1) * multiplier;
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return Math.round(score * 10) / 10;
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}
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```
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