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# Dup1n's solution

## to Space Age in the JavaScript Track

Published at Jul 13 2020 · 0 comments
Instructions
Test suite
Solution

Given an age in seconds, calculate how old someone would be on:

• Mercury: orbital period 0.2408467 Earth years
• Venus: orbital period 0.61519726 Earth years
• Earth: orbital period 1.0 Earth years, 365.25 Earth days, or 31,557,600 seconds
• Mars: orbital period 1.8808158 Earth years
• Jupiter: orbital period 11.862615 Earth years
• Saturn: orbital period 29.447498 Earth years
• Uranus: orbital period 84.016846 Earth years
• Neptune: orbital period 164.79132 Earth years

So if you were told someone were 1,000,000,000 seconds old, you should be able to say that they're 31.69 Earth-years old.

If you're wondering why Pluto didn't make the cut, go watch this youtube video.

## Setup

Go through the setup instructions for Javascript to install the necessary dependencies:

https://exercism.io/tracks/javascript/installation

## Requirements

Please `cd` into exercise directory before running all below commands.

Install assignment dependencies:

``````\$ npm install
``````

## Making the test suite pass

Execute the tests with:

``````\$ npm test
``````

In the test suites all tests but the first have been skipped.

Once you get a test passing, you can enable the next one by changing `xtest` to `test`.

## Submitting Solutions

Once you have a solution ready, you can submit it using:

``````exercism submit space-age.js
``````

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

## Exercise Source Credits

Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=01

### space-age.spec.js

``````import { age } from './space-age';

describe('Space Age', () => {
test('age on Earth', () => {
expect(age('earth', 1000000000)).toEqual(31.69);
});

xtest('age on Mercury', () => {
expect(age('mercury', 2134835688)).toEqual(280.88);
});

xtest('age on Venus', () => {
expect(age('venus', 189839836)).toEqual(9.78);
});

xtest('age on Mars', () => {
expect(age('mars', 2129871239)).toEqual(35.88);
});

xtest('age on Jupiter', () => {
expect(age('jupiter', 901876382)).toEqual(2.41);
});

xtest('age on Saturn', () => {
expect(age('saturn', 2000000000)).toEqual(2.15);
});

xtest('age on Uranus', () => {
expect(age('uranus', 1210123456)).toEqual(0.46);
});

xtest('age on Neptune', () => {
expect(age('neptune', 1821023456)).toEqual(0.35);
});
});``````
``````//
// This is only a SKELETON file for the 'Space Age' exercise. It's been provided as a
// convenience to get you started writing code fas
var periodOrbital = {
mercury: 0.2408467,
venus: 0.61519726,
earth: 1.0,
mars: 1.8808158,
jupiter: 11.862615,
saturn: 29.447498,
uranus: 84.016846,
neptune: 164.79132,
}

export const age = (planet = "", seconds = 0) => {
var earthSecond = periodOrbital[planet] * 31557600;
return Math.round((seconds / earthSecond)*100)/100;
};``````

### What can you learn from this solution?

A huge amount can be learned from reading other peopleâ€™s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

• What compromises have been made?
• Are there new concepts here that you could read more about to improve your understanding?