Add space-age exercise (#63)

config.json

@@ -273,6 +273,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "space-age",
+        "name": "Space Age",
+        "uuid": "79decac4-6fd3-45cb-b53f-aa6c6044d032",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "sum-of-multiples",
         "name": "Sum of Multiples",

exercises/practice/space-age/.docs/instructions.md

@@ -0,0 +1,28 @@
+# Instructions
+
+Given an age in seconds, calculate how old someone would be on a planet in our Solar System.
+
+One Earth year equals 365.25 Earth days, or 31,557,600 seconds.
+If you were told someone was 1,000,000,000 seconds old, their age would be 31.69 Earth-years.
+
+For the other planets, you have to account for their orbital period in Earth Years:
+
+| Planet  | Orbital period in Earth Years |
+| ------- | ----------------------------- |
+| Mercury | 0.2408467                     |
+| Venus   | 0.61519726                    |
+| Earth   | 1.0                           |
+| Mars    | 1.8808158                     |
+| Jupiter | 11.862615                     |
+| Saturn  | 29.447498                     |
+| Uranus  | 84.016846                     |
+| Neptune | 164.79132                     |
+
+~~~~exercism/note
+The actual length of one complete orbit of the Earth around the sun is closer to 365.256 days (1 sidereal year).
+The Gregorian calendar has, on average, 365.2425 days.
+While not entirely accurate, 365.25 is the value used in this exercise.
+See [Year on Wikipedia][year] for more ways to measure a year.
+
+[year]: https://en.wikipedia.org/wiki/Year#Summary
+~~~~

exercises/practice/space-age/.docs/introduction.md

@@ -0,0 +1,20 @@
+# Introduction
+
+The year is 2525 and you've just embarked on a journey to visit all planets in the Solar System (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune).
+The first stop is Mercury, where customs require you to fill out a form (bureaucracy is apparently _not_ Earth-specific).
+As you hand over the form to the customs officer, they scrutinize it and frown.
+"Do you _really_ expect me to believe you're just 50 years old?
+You must be closer to 200 years old!"
+
+Amused, you wait for the customs officer to start laughing, but they appear to be dead serious.
+You realize that you've entered your age in _Earth years_, but the officer expected it in _Mercury years_!
+As Mercury's orbital period around the sun is significantly shorter than Earth, you're actually a lot older in Mercury years.
+After some quick calculations, you're able to provide your age in Mercury Years.
+The customs officer smiles, satisfied, and waves you through.
+You make a mental note to pre-calculate your planet-specific age _before_ future customs checks, to avoid such mix-ups.
+
+~~~~exercism/note
+If you're wondering why Pluto didn't make the cut, go watch [this YouTube video][pluto-video].
+
+[pluto-video]: https://www.youtube.com/watch?v=Z_2gbGXzFbs
+~~~~

exercises/practice/space-age/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "space-age.ua"
+    ],
+    "test": [
+      "tests.ua"
+    ],
+    "example": [
+      ".meta/example.ua"
+    ]
+  },
+  "blurb": "Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.",
+  "source": "Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial.",
+  "source_url": "https://pine.fm/LearnToProgram/?Chapter=01"
+}

exercises/practice/space-age/.meta/example.ua

@@ -0,0 +1,5 @@
+OrbitalPeriods ← map {"Mercury" "Venus" "Earth" "Mars" "Jupiter" "Saturn" "Uranus" "Neptune"} [0.2408467 0.61519726 1 1.8808158 11.862615 29.447498 84.016846 164.79132]
+
+Round           ← |1 ÷ 100 ⁅ × 100
+EarthYearPeriod ← |1 ÷ 31557600
+SpaceAge        ← |2 Round ÷ ⍣(get : OrbitalPeriods)(⍤ "not a planet") ⊙EarthYearPeriod

exercises/practice/space-age/.meta/tests.toml

@@ -0,0 +1,37 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[84f609af-5a91-4d68-90a3-9e32d8a5cd34]
+description = "age on Earth"
+
+[ca20c4e9-6054-458c-9312-79679ffab40b]
+description = "age on Mercury"
+
+[502c6529-fd1b-41d3-8fab-65e03082b024]
+description = "age on Venus"
+
+[9ceadf5e-a0d5-4388-9d40-2c459227ceb8]
+description = "age on Mars"
+
+[42927dc3-fe5e-4f76-a5b5-f737fc19bcde]
+description = "age on Jupiter"
+
+[8469b332-7837-4ada-b27c-00ee043ebcad]
+description = "age on Saturn"
+
+[999354c1-76f8-4bb5-a672-f317b6436743]
+description = "age on Uranus"
+
+[80096d30-a0d4-4449-903e-a381178355d8]
+description = "age on Neptune"
+
+[57b96e2a-1178-40b7-b34d-f3c9c34e4bf4]
+description = "invalid planet causes error"

exercises/practice/space-age/space-age.ua

@@ -0,0 +1,3 @@
+# Calculate someone's space age
+# Age ? Planet Seconds
+SpaceAge ← |2 ⊙(⍤ "Please implement LargestProduct")

exercises/practice/space-age/tests.ua

@@ -0,0 +1,28 @@
+~ "space-age.ua" ~ SpaceAge
+
+# age on Earth
+⍤⤙≍ 31.69 SpaceAge "Earth" 1000000000
+
+# age on Mercury
+⍤⤙≍ 280.88 SpaceAge "Mercury" 2134835688
+
+# age on Venus
+⍤⤙≍ 9.78 SpaceAge "Venus" 189839836
+
+# age on Mars
+⍤⤙≍ 35.88 SpaceAge "Mars" 2129871239
+
+# age on Jupiter
+⍤⤙≍ 2.41 SpaceAge "Jupiter" 901876382
+
+# age on Saturn
+⍤⤙≍ 2.15 SpaceAge "Saturn" 2000000000
+
+# age on Uranus
+⍤⤙≍ 0.46 SpaceAge "Uranus" 1210123456
+
+# age on Neptune
+⍤⤙≍ 0.35 SpaceAge "Neptune" 1821023456
+
+# invalid planet causes error
+⍤⤙≍ "not a planet" ⍣(SpaceAge "Sun" 680804807)