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Merge pull request #196 from atk/spiral-matrix
new exercise: spiral-matrix
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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": "spiral-matrix",
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"name": "Spiral Matrix",
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"uuid": "cbf5bf2f-6b53-4d49-9ac7-0da10889c333",
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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": "twelve-days",
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"name": "Twelve Days",

‎exercises/practice/spiral-matrix/.docs/instructions.append.md

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## Output format
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The output is expected as a flat array of u16 numbers; it will be deserialized into the required square array of arrays:
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```js
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// output
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[1,2,3,8,9,4,7,6,5]
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// =>
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// [[1, 2, 3],
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// [8, 9, 4],
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// [7, 6, 5]]
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```

‎exercises/practice/spiral-matrix/.docs/instructions.md

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# Instructions
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Your task is to return a square matrix of a given size.
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The matrix should be filled with natural numbers, starting from 1 in the top-left corner, increasing in an inward, clockwise spiral order, like these examples:
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## Examples
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### Spiral matrix of size 3
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```text
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1 2 3
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8 9 4
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7 6 5
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```
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### Spiral matrix of size 4
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```text
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1 2 3 4
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12 13 14 5
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11 16 15 6
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10 9 8 7
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```

‎exercises/practice/spiral-matrix/.docs/introduction.md

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# Introduction
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In a small village near an ancient forest, there was a legend of a hidden treasure buried deep within the woods.
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Despite numerous attempts, no one had ever succeeded in finding it.
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This was about to change, however, thanks to a young explorer named Elara.
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She had discovered an old document containing instructions on how to locate the treasure.
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Using these instructions, Elara was able to draw a map that revealed the path to the treasure.
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To her surprise, the path followed a peculiar clockwise spiral.
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It was no wonder no one had been able to find the treasure before!
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With the map in hand, Elara embarks on her journey to uncover the hidden treasure.

‎exercises/practice/spiral-matrix/.eslintrc

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{
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"root": true,
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"extends": "@exercism/eslint-config-javascript",
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"env": {
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"jest": true
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},
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"overrides": [
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{
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"files": [
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"*.spec.js"
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],
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"excludedFiles": [
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"custom.spec.js"
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],
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"extends": "@exercism/eslint-config-javascript/maintainers"
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}
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]
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}

‎exercises/practice/spiral-matrix/.meta/config.json

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{
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"authors": [
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"atk"
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],
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"files": {
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"solution": [
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"spiral-matrix.wat"
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],
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"test": [
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"spiral-matrix.spec.js"
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],
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"example": [
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".meta/proof.ci.wat"
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],
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"invalidator": [
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"package.json"
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]
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},
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"blurb": "Given the size, return a square matrix of numbers in spiral order.",
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"source": "Reddit r/dailyprogrammer challenge #320 [Easy] Spiral Ascension.",
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"source_url": "https://web.archive.org/web/20230607064729/https://old.reddit.com/r/dailyprogrammer/comments/6i60lr/20170619_challenge_320_easy_spiral_ascension/",
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"custom": {
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"version.tests.compatibility": "jest-27",
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"flag.tests.task-per-describe": false,
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"flag.tests.may-run-long": false,
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"flag.tests.includes-optional": false
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}
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}

‎exercises/practice/spiral-matrix/.meta/proof.ci.wat

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(module
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(memory (export "mem") 1)
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(global $outputOffset i32 (i32.const 64))
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;;
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;; Recursively calculate one number from the spiral
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;;
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;; @param {i32} $width - remaining width of the spiral
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;; @param {i32} $height - remaining height of the spiral
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;; @param {i32} $x - current x position in the matrix
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;; @param {i32} $y - current y position in the matrix
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;;
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;; @returns {i32} - current number
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;;
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(func $spiral (param $width i32) (param $height i32) (param $x i32) (param $y i32) (result i32)
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(if (i32.le_s (local.get $y) (i32.const 0)) (then
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(return (i32.add (local.get $x) (i32.const 1)))))
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(i32.add (local.get $width)
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(call $spiral (i32.sub (local.get $height) (i32.const 1)) (local.get $width)
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(i32.sub (local.get $y) (i32.const 1))
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(i32.sub (i32.sub (local.get $width) (local.get $x)) (i32.const 1))))
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)
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;;
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;; Generate an array of u16 numbers that when put into a square 2d-array will result in a spiral matrix
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;;
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;; @param {i32} $size - length of the sides of the matrix
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;;
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;; @returns {(i32,i32)} - offset and length of the u16 number array
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;;
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(func (export "spiralMatrix") (param $size i32) (result i32 i32)
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(local $x i32)
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(local $y i32)
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(loop $line
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(local.set $x (i32.const 0))
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(loop $column
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(i32.store16 (i32.add (global.get $outputOffset)
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(i32.shl (i32.add (i32.mul (local.get $y) (local.get $size))
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(local.get $x)) (i32.const 1)))
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(call $spiral (local.get $size) (local.get $size)
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(local.get $x) (local.get $y)))
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(local.set $x (i32.add (local.get $x) (i32.const 1)))
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(br_if $column (i32.le_u (local.get $x) (local.get $size))))
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(local.set $y (i32.add (local.get $y) (i32.const 1)))
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(br_if $line (i32.le_u (local.get $y) (local.get $size))))
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(global.get $outputOffset) (i32.mul (local.get $size) (local.get $size))
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)
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)

‎exercises/practice/spiral-matrix/.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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[8f584201-b446-4bc9-b132-811c8edd9040]
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description = "empty spiral"
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[e40ae5f3-e2c9-4639-8116-8a119d632ab2]
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description = "trivial spiral"
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[cf05e42d-eb78-4098-a36e-cdaf0991bc48]
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description = "spiral of size 2"
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[1c475667-c896-4c23-82e2-e033929de939]
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description = "spiral of size 3"
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[05ccbc48-d891-44f5-9137-f4ce462a759d]
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description = "spiral of size 4"
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[f4d2165b-1738-4e0c-bed0-c459045ae50d]
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description = "spiral of size 5"

‎exercises/practice/spiral-matrix/.npmrc

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audit=false

‎exercises/practice/spiral-matrix/LICENSE

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MIT License
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Copyright (c) 2021 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.

‎exercises/practice/spiral-matrix/babel.config.js

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export default {
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presets: ["@exercism/babel-preset-javascript"],
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plugins: [],
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};

‎exercises/practice/spiral-matrix/package.json

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{
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"name": "@exercism/wasm-spiral-matrix",
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"description": "Exercism exercises in WebAssembly.",
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"author": "Alex Lohr",
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"type": "module",
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"private": true,
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"license": "MIT",
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"repository": {
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"type": "git",
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"url": "https://github.com/exercism/wasm",
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"directory": "exercises/practice/spiral-matrix"
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},
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"jest": {
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"maxWorkers": 1
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},
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"devDependencies": {
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"@babel/core": "^7.23.3",
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"@exercism/babel-preset-javascript": "^0.4.0",
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"@exercism/eslint-config-javascript": "^0.6.0",
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"@types/jest": "^29.5.8",
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"@types/node": "^20.9.1",
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"babel-jest": "^29.7.0",
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"core-js": "^3.33.2",
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"eslint": "^8.54.0",
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"jest": "^29.7.0"
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},
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"dependencies": {
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"@exercism/wasm-lib": "^0.2.0"
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},
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"scripts": {
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"test": "node --experimental-vm-modules node_modules/jest/bin/jest.js ./*",
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"watch": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch ./*",
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"lint": "eslint ."
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}
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}

‎exercises/practice/spiral-matrix/spiral-matrix.spec.js

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import { compileWat, WasmRunner } from "@exercism/wasm-lib";
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let wasmModule;
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let currentInstance;
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beforeAll(async () => {
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try {
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const watPath = new URL("./spiral-matrix.wat", import.meta.url);
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const { buffer } = await compileWat(watPath);
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wasmModule = await WebAssembly.compile(buffer);
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} catch (err) {
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console.log(`Error compiling *.wat: \n${err}`);
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process.exit(1);
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}
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});
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const spiralMatrix = (size) => {
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const [outputOffset, outputLength] = currentInstance.exports.spiralMatrix(size);
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const output = currentInstance.get_mem_as_u16(outputOffset, outputLength);
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console.log(output);
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const outputIterator = output[Symbol.iterator]();
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return Array.from({ length: size }, () =>
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Array.from({ length: size}, () => outputIterator.next()?.value));
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}
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describe('Spiral Matrix', () => {
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beforeEach(async () => {
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currentInstance = null;
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if (!wasmModule) {
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return Promise.reject();
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}
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try {
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currentInstance = await new WasmRunner(wasmModule);
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return Promise.resolve();
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} catch (err) {
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console.log(`Error instantiating WebAssembly module: ${err}`);
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return Promise.reject();
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}
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});
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test('empty spiral', () => {
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const expected = [];
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const actual = spiralMatrix(0);
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expect(actual).toEqual(expected);
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});
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xtest('trivial spiral', () => {
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const expected = [[1]];
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const actual = spiralMatrix(1);
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expect(actual).toEqual(expected);
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});
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xtest('spiral of size 2', () => {
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const expected = [
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[1, 2],
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[4, 3],
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];
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const actual = spiralMatrix(2);
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expect(actual).toEqual(expected);
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});
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xtest('spiral of size 3', () => {
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const expected = [
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[1, 2, 3],
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[8, 9, 4],
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[7, 6, 5],
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];
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const actual = spiralMatrix(3);
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expect(actual).toEqual(expected);
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});
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xtest('spiral of size 4', () => {
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const expected = [
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[1, 2, 3, 4],
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[12, 13, 14, 5],
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[11, 16, 15, 6],
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[10, 9, 8, 7],
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];
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const actual = spiralMatrix(4);
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expect(actual).toEqual(expected);
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});
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xtest('spiral of size 5', () => {
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const expected = [
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[1, 2, 3, 4, 5],
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[16, 17, 18, 19, 6],
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[15, 24, 25, 20, 7],
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[14, 23, 22, 21, 8],
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[13, 12, 11, 10, 9],
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];
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const actual = spiralMatrix(5);
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expect(expected).toEqual(actual);
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});
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});

‎exercises/practice/spiral-matrix/spiral-matrix.wat

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(module
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(memory (export "mem") 1)
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;;
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;; Generate an array of u16 numbers that when put into a square 2d-array will result in a spiral matrix
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;;
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;; @param {i32} $size - length of the sides of the matrix
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;;
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;; @returns {(i32,i32)} - offset and length of the u16 number array
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;;
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(func (export "spiralMatrix") (param $size i32) (result i32 i32)
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(i32.const 0) (i32.const 0)
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)
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)

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