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glennjglennj
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Add food-chain exercise (exercism#203)
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‎config.json

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"prerequisites": [],
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"difficulty": 4
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},
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{
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"slug": "food-chain",
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"name": "Food Chain",
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"uuid": "24277aaf-7ecb-47ce-b8a9-e309695d020f",
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"practices": [],
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"prerequisites": [],
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"difficulty": 4
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},
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{
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"slug": "simple-linked-list",
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"name": "Simple Linked List",

‎exercises/practice/food-chain/.docs/instructions.append.md

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# ignore
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## Method Signatures in Wren
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In wren, you can overload methods _by arity_.
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That means your class can have two (or more) methods with the **same name** as long as they accept different numbers of arguments.
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See [Signatures][signatures] for more details.
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[signatures]: https://wren.io/method-calls.html#signature

‎exercises/practice/food-chain/.docs/instructions.md

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# Instructions
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Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.
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While you could copy/paste the lyrics, or read them from a file, this problem is much more interesting if you approach it algorithmically.
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This is a [cumulative song][cumulative-song] of unknown origin.
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This is one of many common variants.
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```text
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I know an old lady who swallowed a fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a spider.
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It wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a bird.
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How absurd to swallow a bird!
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a cat.
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Imagine that, to swallow a cat!
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a dog.
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What a hog, to swallow a dog!
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She swallowed the dog to catch the cat.
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a goat.
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Just opened her throat and swallowed a goat!
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She swallowed the goat to catch the dog.
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She swallowed the dog to catch the cat.
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a cow.
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I don't know how she swallowed a cow!
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She swallowed the cow to catch the goat.
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She swallowed the goat to catch the dog.
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She swallowed the dog to catch the cat.
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She swallowed the cat to catch the bird.
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She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
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She swallowed the spider to catch the fly.
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I don't know why she swallowed the fly. Perhaps she'll die.
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I know an old lady who swallowed a horse.
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She's dead, of course!
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```
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[cumulative-song]: https://en.wikipedia.org/wiki/Cumulative_song

‎exercises/practice/food-chain/.meta/config.json

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{
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"authors": [
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"glennj"
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],
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"files": {
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"solution": [
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"food-chain.wren"
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],
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"test": [
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"food-chain.spec.wren"
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],
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"example": [
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".meta/proof.ci.wren"
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]
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},
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"blurb": "Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/There_Was_an_Old_Lady_Who_Swallowed_a_Fly"
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}

‎exercises/practice/food-chain/.meta/proof.ci.wren

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class FoodChain {
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/// Recite verse number `n`
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static recite(n) { new().verse(n - 1) }
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/// Recite verses from number `from` to number `to` inclusive
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static recite(from, to) {
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var chain = new()
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var lines = []
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for (n in from..to) {
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lines.addAll(chain.verse(n - 1))
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lines.add("")
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}
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return lines[0...-1]
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}
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construct new() {
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_animals = ["fly", "spider", "bird", "cat", "dog", "goat", "cow", "horse"]
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_phrases = {
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"spider": "It wriggled and jiggled and tickled inside her.",
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"bird": "How absurd to swallow a bird!",
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"cat": "Imagine that, to swallow a cat!",
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"dog": "What a hog, to swallow a dog!",
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"goat": "Just opened her throat and swallowed a goat!",
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"cow": "I don't know how she swallowed a cow!",
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"horse": "She's dead, of course!"
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}
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}
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verse(i) {
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var lines = []
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var animal = _animals[i]
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lines.add("I know an old lady who swallowed a %(animal).")
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if (animal != "fly") {
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lines.add(_phrases[animal])
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if (animal == "horse") {
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return lines
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}
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var predator = animal
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for (j in i..1) {
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var prey = _animals[j - 1]
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var extra = prey == "spider" ? " that wriggled and jiggled and tickled inside her" : ""
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lines.add("She swallowed the %(predator) to catch the %(prey)%(extra).")
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predator = prey
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}
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}
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lines.add("I don't know why she swallowed the fly. Perhaps she'll die.")
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return lines
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}
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}

‎exercises/practice/food-chain/.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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[751dce68-9412-496e-b6e8-855998c56166]
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description = "fly"
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[6c56f861-0c5e-4907-9a9d-b2efae389379]
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description = "spider"
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[3edf5f33-bef1-4e39-ae67-ca5eb79203fa]
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description = "bird"
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[e866a758-e1ff-400e-9f35-f27f28cc288f]
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description = "cat"
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[3f02c30e-496b-4b2a-8491-bc7e2953cafb]
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description = "dog"
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[4b3fd221-01ea-46e0-825b-5734634fbc59]
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description = "goat"
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[1b707da9-7001-4fac-941f-22ad9c7a65d4]
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description = "cow"
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[3cb10d46-ae4e-4d2c-9296-83c9ffc04cdc]
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description = "horse"
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[22b863d5-17e4-4d1e-93e4-617329a5c050]
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description = "multiple verses"
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[e626b32b-745c-4101-bcbd-3b13456893db]
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description = "full song"

‎exercises/practice/food-chain/LICENSE

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MIT License
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Copyright (c) 2024 Exercism
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

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