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80 lines
2.1 KiB
Markdown
80 lines
2.1 KiB
Markdown
---
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id: 68c1a929005bf54d342aa8d4
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title: "Challenge 57: Space Week Day 3: Phone Home"
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challengeType: 28
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dashedName: challenge-57
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---
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# --description--
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For day three of Space Week, you are given an array of numbers representing distances (in kilometers) between yourself, satellites, and your home planet in a communication route. Determine how long it will take a message sent through the route to reach its destination planet using the following constraints:
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- The first value in the array is the distance from your location to the first satellite.
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- Each subsequent value, except for the last, is the distance to the next satellite.
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- The last value in the array is the distance from the previous satellite to your home planet.
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- The message travels at 300,000 km/s.
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- Each satellite the message **passes through** adds a 0.5 second transmission delay.
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- Return a number rounded to 4 decimal places, with trailing zeros removed.
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# --hints--
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`sendMessage([300000, 300000])` should return `2.5`.
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```js
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assert.equal(sendMessage([300000, 300000]), 2.5);
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```
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`sendMessage([384400, 384400])` should return `3.0627`.
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```js
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assert.equal(sendMessage([384400, 384400]), 3.0627);
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```
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`sendMessage([54600000, 54600000])` should return `364.5`.
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```js
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assert.equal(sendMessage([54600000, 54600000]), 364.5);
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```
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`sendMessage([1000000, 500000000, 1000000])` should return `1674.3333`.
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```js
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assert.equal(sendMessage([1000000, 500000000, 1000000]), 1674.3333);
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```
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`sendMessage([10000, 21339, 50000, 31243, 10000])` should return `2.4086`.
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```js
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assert.equal(sendMessage([10000, 21339, 50000, 31243, 10000]), 2.4086);
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```
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`sendMessage([802101, 725994, 112808, 3625770, 481239])` should return `21.1597`.
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```js
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assert.equal(sendMessage([802101, 725994, 112808, 3625770, 481239]), 21.1597);
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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 sendMessage(route) {
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return route;
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}
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```
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# --solutions--
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```js
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function sendMessage(route) {
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let totalDistance = route.reduce((a, d) => a += d, 0);
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const delay = (route.length - 1) * 0.5
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const time = totalDistance / 300000
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const total = time + delay;
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return Number(total.toFixed(4))
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}
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```
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