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Add practice exercise: dnd-character (#204)
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‎config.json

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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "dnd-character",
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"name": "D&D Character",
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"uuid": "d2da9563-a621-4e02-b2e4-f9553f3b82fc",
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"practices": [],
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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "eliuds-eggs",
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"name": "Eliud's Eggs",

‎exercises/practice/dnd-character/.docs/instructions.md

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# Instructions
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For a game of [Dungeons & Dragons][dnd], each player starts by generating a character they can play with.
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This character has, among other things, six abilities; strength, dexterity, constitution, intelligence, wisdom and charisma.
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These six abilities have scores that are determined randomly.
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You do this by rolling four 6-sided dice and recording the sum of the largest three dice.
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You do this six times, once for each ability.
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Your character's initial hitpoints are 10 + your character's constitution modifier.
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You find your character's constitution modifier by subtracting 10 from your character's constitution, divide by 2 and round down.
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Write a random character generator that follows the above rules.
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For example, the six throws of four dice may look like:
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- 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
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- 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
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- 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
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- 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
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- 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
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- 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.
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Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.
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~~~~exercism/note
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Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice.
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One such language is [Troll][troll].
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[troll]: https://di.ku.dk/Ansatte/?pure=da%2Fpublications%2Ftroll-a-language-for-specifying-dicerolls(84a45ff0-068b-11df-825d-000ea68e967b)%2Fexport.html
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~~~~
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[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons

‎exercises/practice/dnd-character/.docs/introduction.md

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# Introduction
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After weeks of anticipation, you and your friends get together for your very first game of [Dungeons & Dragons][dnd] (D&D).
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Since this is the first session of the game, each player has to generate a character to play with.
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The character's abilities are determined by rolling 6-sided dice, but where _are_ the dice?
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With a shock, you realize that your friends are waiting for _you_ to produce the dice; after all it was your idea to play D&D!
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Panicking, you realize you forgot to bring the dice, which would mean no D&D game.
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As you have some basic coding skills, you quickly come up with a solution: you'll write a program to simulate dice rolls.
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[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons

‎exercises/practice/dnd-character/.meta/config.json

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{
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"authors": [
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"jimmytty"
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],
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"files": {
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"solution": [
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"dnd-character.sql"
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],
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"test": [
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"dnd-character_test.sql"
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],
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"example": [
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".meta/example.sql"
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]
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},
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"blurb": "Randomly generate Dungeons & Dragons characters.",
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"source": "Simon Shine, Erik Schierboom",
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"source_url": "https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945"
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}

‎exercises/practice/dnd-character/.meta/example.sql

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UPDATE "dnd-character"
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SET modifier = FLOOR((constitution - 10) / 2.0)
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WHERE property = 'modifier'
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AND input = 'score'
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;
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UPDATE "dnd-character"
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SET wisdom = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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)
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WHERE property = 'ability'
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AND input = 'random'
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;
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UPDATE "dnd-character"
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SET
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strength = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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),
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dexterity = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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),
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constitution = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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),
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intelligence = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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),
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wisdom = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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),
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charisma = (
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SELECT SUM(score)
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FROM (
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SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
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FROM generate_series(1, 4) AS times
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ORDER BY score DESC
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LIMIT 3
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)
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)
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WHERE property = 'character'
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AND input = 'random'
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;
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UPDATE "dnd-character"
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SET modifier = FLOOR((constitution - 10) / 2.0)
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WHERE property = 'character'
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AND input = 'random'
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;
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UPDATE "dnd-character"
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SET hitpoints = 10 + modifier
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WHERE property = 'character'
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AND input = 'random'
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;
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UPDATE "dnd-character" AS a
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SET strength = b.strength,
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dexterity = b.dexterity,
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constitution = b.constitution,
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intelligence = b.intelligence,
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wisdom = b.wisdom,
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charisma = b.charisma
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FROM "dnd-character" AS b
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WHERE a.property = b.property
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AND a.property = 'character'
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AND a.input = ''
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AND b.input = 'random'
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;

‎exercises/practice/dnd-character/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37]
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description = "ability modifier -> ability modifier for score 3 is -4"
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[cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c]
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description = "ability modifier -> ability modifier for score 4 is -3"
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[5b519fcd-6946-41ee-91fe-34b4f9808326]
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description = "ability modifier -> ability modifier for score 5 is -3"
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[dc2913bd-6d7a-402e-b1e2-6d568b1cbe21]
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description = "ability modifier -> ability modifier for score 6 is -2"
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[099440f5-0d66-4b1a-8a10-8f3a03cc499f]
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description = "ability modifier -> ability modifier for score 7 is -2"
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[cfda6e5c-3489-42f0-b22b-4acb47084df0]
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description = "ability modifier -> ability modifier for score 8 is -1"
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[c70f0507-fa7e-4228-8463-858bfbba1754]
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description = "ability modifier -> ability modifier for score 9 is -1"
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[6f4e6c88-1cd9-46a0-92b8-db4a99b372f7]
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description = "ability modifier -> ability modifier for score 10 is 0"
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[e00d9e5c-63c8-413f-879d-cd9be9697097]
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description = "ability modifier -> ability modifier for score 11 is 0"
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[eea06f3c-8de0-45e7-9d9d-b8cab4179715]
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description = "ability modifier -> ability modifier for score 12 is +1"
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[9c51f6be-db72-4af7-92ac-b293a02c0dcd]
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description = "ability modifier -> ability modifier for score 13 is +1"
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[94053a5d-53b6-4efc-b669-a8b5098f7762]
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description = "ability modifier -> ability modifier for score 14 is +2"
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[8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2]
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description = "ability modifier -> ability modifier for score 15 is +2"
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[c3ec871e-1791-44d0-b3cc-77e5fb4cd33d]
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description = "ability modifier -> ability modifier for score 16 is +3"
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[3d053cee-2888-4616-b9fd-602a3b1efff4]
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description = "ability modifier -> ability modifier for score 17 is +3"
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[bafd997a-e852-4e56-9f65-14b60261faee]
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description = "ability modifier -> ability modifier for score 18 is +4"
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[4f28f19c-2e47-4453-a46a-c0d365259c14]
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description = "random ability is within range"
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[385d7e72-864f-4e88-8279-81a7d75b04ad]
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description = "random character is valid"
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[2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe]
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description = "each ability is only calculated once"
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include = false
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[dca2b2ec-f729-4551-84b9-078876bb4808]
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description = "each ability is only calculated once"
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reimplements = "2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe"

‎exercises/practice/dnd-character/create_fixture.sql

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DROP TABLE IF EXISTS "dnd-character";
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CREATE TABLE "dnd-character" (
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property TEXT NOT NULL,
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input TEXT NOT NULL,
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strength INTEGER ,
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dexterity INTEGER ,
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constitution INTEGER ,
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intelligence INTEGER ,
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wisdom INTEGER ,
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charisma INTEGER ,
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modifier INTEGER ,
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hitpoints INTEGER
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);
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.mode csv
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.import ./data.csv "dnd-character"
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UPDATE "dnd-character" SET strength = NULL WHERE strength = '';
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UPDATE "dnd-character" SET dexterity = NULL WHERE dexterity = '';
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UPDATE "dnd-character" SET constitution = NULL WHERE constitution = '';
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UPDATE "dnd-character" SET intelligence = NULL WHERE intelligence = '';
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UPDATE "dnd-character" SET wisdom = NULL WHERE wisdom = '';
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UPDATE "dnd-character" SET charisma = NULL WHERE charisma = '';
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UPDATE "dnd-character" SET modifier = NULL WHERE modifier = '';
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UPDATE "dnd-character" SET hitpoints = NULL WHERE hitpoints = '';

‎exercises/practice/dnd-character/create_test_table.sql

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DROP TABLE IF EXISTS tests;
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CREATE TABLE IF NOT EXISTS tests (
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-- uuid and description are taken from the test.toml file
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uuid TEXT PRIMARY KEY,
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description TEXT NOT NULL,
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-- The following section is needed by the online test-runner
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status TEXT DEFAULT 'fail',
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message TEXT,
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output TEXT,
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test_code TEXT,
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task_id INTEGER DEFAULT NULL,
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-- Here are columns for the actual tests
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property TEXT NOT NULL,
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input TEXT NOT NULL,
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constitution INTEGER,
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modifier INTEGER,
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expected TEXT NOT NULL
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);
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INSERT INTO tests (
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uuid,
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description,
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property,
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input,
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constitution,
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modifier,
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expected
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)
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VALUES
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('1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37', 'ability modifier for score 3 is -4', 'modifier', 'score', 3, -4, ''),
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('cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c', 'ability modifier for score 4 is -3', 'modifier', 'score', 4, -3, ''),
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('5b519fcd-6946-41ee-91fe-34b4f9808326', 'ability modifier for score 5 is -3', 'modifier', 'score', 5, -3, ''),
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('dc2913bd-6d7a-402e-b1e2-6d568b1cbe21', 'ability modifier for score 6 is -2', 'modifier', 'score', 6, -2, ''),
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('099440f5-0d66-4b1a-8a10-8f3a03cc499f', 'ability modifier for score 7 is -2', 'modifier', 'score', 7, -2, ''),
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('cfda6e5c-3489-42f0-b22b-4acb47084df0', 'ability modifier for score 8 is -1', 'modifier', 'score', 8, -1, ''),
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('c70f0507-fa7e-4228-8463-858bfbba1754', 'ability modifier for score 9 is -1', 'modifier', 'score', 9, -1, ''),
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('6f4e6c88-1cd9-46a0-92b8-db4a99b372f7', 'ability modifier for score 10 is 0', 'modifier', 'score', 10, 0, ''),
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('e00d9e5c-63c8-413f-879d-cd9be9697097', 'ability modifier for score 11 is 0', 'modifier', 'score', 11, 0, ''),
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('eea06f3c-8de0-45e7-9d9d-b8cab4179715', 'ability modifier for score 12 is +1', 'modifier', 'score', 12, 1, ''),
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('9c51f6be-db72-4af7-92ac-b293a02c0dcd', 'ability modifier for score 13 is +1', 'modifier', 'score', 13, 1, ''),
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('94053a5d-53b6-4efc-b669-a8b5098f7762', 'ability modifier for score 14 is +2', 'modifier', 'score', 14, 2, ''),
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('8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2', 'ability modifier for score 15 is +2', 'modifier', 'score', 15, 2, ''),
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('c3ec871e-1791-44d0-b3cc-77e5fb4cd33d', 'ability modifier for score 16 is +3', 'modifier', 'score', 16, 3, ''),
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('3d053cee-2888-4616-b9fd-602a3b1efff4', 'ability modifier for score 17 is +3', 'modifier', 'score', 17, 3, ''),
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('bafd997a-e852-4e56-9f65-14b60261faee', 'ability modifier for score 18 is +4', 'modifier', 'score', 18, 4, ''),
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('4f28f19c-2e47-4453-a46a-c0d365259c14', 'random ability is within range', 'ability', 'random', NULL, NULL, 'score >= 3 && score <= 18'),
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('385d7e72-864f-4e88-8279-81a7d75b04ad', 'random character is valid', 'character', 'random', NULL, NULL, '{"strength":"strength >= 3 && strength <= 18","dexterity":"dexterity >= 3 && dexterity <= 18","constitution":"constitution >= 3 && constitution <= 18","intelligence":"intelligence >= 3 && intelligence <= 18","wisdom":"wisdom >= 3 && wisdom <= 18","charisma":"charisma >= 3 && charisma <= 18","hitpoints":"hitpoints == 10 + modifier(constitution)"}'),
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('dca2b2ec-f729-4551-84b9-078876bb4808', 'each ability is only calculated once', 'character', '', NULL, NULL, '{"strength":"strength == strength","dexterity":"dexterity == dexterity","constitution":"constitution == constitution","intelligence":"intelligence == intelligence","wisdom":"wisdom == wisdom","charisma":"charisma == charisma"}');

‎exercises/practice/dnd-character/data.csv

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"modifier","score",,,3,,,,,
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"modifier","score",,,4,,,,,
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"modifier","score",,,5,,,,,
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"modifier","score",,,6,,,,,
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"modifier","score",,,7,,,,,
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"modifier","score",,,8,,,,,
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"modifier","score",,,9,,,,,
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"modifier","score",,,10,,,,,
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"modifier","score",,,11,,,,,
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"modifier","score",,,12,,,,,
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"modifier","score",,,13,,,,,
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"modifier","score",,,14,,,,,
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"modifier","score",,,15,,,,,
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"modifier","score",,,16,,,,,
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"modifier","score",,,17,,,,,
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"modifier","score",,,18,,,,,
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"ability","random",,,,,,,,
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"character","random",,,,,,,,
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"character","",,,,,,,,

‎exercises/practice/dnd-character/dnd-character.sql

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-- Schema:
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-- CREATE TABLE "dnd-character" (
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-- property TEXT NOT NULL,
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-- input TEXT NOT NULL,
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-- strength INTEGER ,
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-- dexterity INTEGER ,
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-- constitution INTEGER ,
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-- intelligence INTEGER ,
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-- wisdom INTEGER ,
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-- charisma INTEGER ,
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-- modifier INTEGER ,
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-- hitpoints INTEGER
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-- );
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--
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-- Task: update the dnd-character table and set the appropriate columns based on the property and the input.

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