Feat: add new Markdown parser (#39800)
and change all the challenges to new `md` format.
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Oliver Eyton-Williams
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@ -5,48 +5,145 @@ challengeType: 5
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forumTopicId: 385288
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---
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## Description
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<section id='description'>
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# --description--
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The Lempel-Ziv-Welch (LZW) algorithm provides loss-less data compression.
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You can read a complete description of it in the <a href="https://en.wikipedia.org/wiki/Lempel-Ziv-Welch" target="_blank">Wikipedia article</a> on the subject.
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</section>
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## Instructions
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<section id='instructions'>
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Write a function that takes two parameters. The first parameter is a boolean where `true` indicates compress and `false` indicates decompress. The second parameter is either a string or an array to be processed. If it is a string to be compressed, return an array of numbers. If it's an array of numbers to be decompressed, return a string.
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</section>
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You can read a complete description of it in the [Wikipedia article](https://en.wikipedia.org/wiki/Lempel-Ziv-Welch) on the subject.
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## Tests
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<section id='tests'>
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# --instructions--
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```yml
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tests:
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- text: <code>LZW</code> should be a function.
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testString: assert(typeof LZW === 'function');
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- text: <code>LZW(true, "TOBEORNOTTOBEORTOBEORNOT")</code> should return a array.
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testString: assert(Array.isArray(LZW(true, "TOBEORNOTTOBEORTOBEORNOT")));
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- text: <code>LZW(false, [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263])</code> should return a string.
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testString: assert(typeof LZW(false, [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263]) === 'string');
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- text: <code>LZW(true, "TOBEORNOTTOBEORTOBEORNOT")</code> should return <code>[84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263]</code>.
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testString: assert.deepEqual(LZW(true, "TOBEORNOTTOBEORTOBEORNOT"), [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263]);
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- text: <code>LZW(false, [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263])</code> should return <code>"TOBEORNOTTOBEORTOBEORNOT"</code>.
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testString: assert.equal(LZW(false, [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263]), "TOBEORNOTTOBEORTOBEORNOT");
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- text: <code>LZW(true, "0123456789")</code> should return <code>[48, 49, 50, 51, 52, 53, 54, 55, 56, 57]</code>.
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testString: assert.deepEqual(LZW(true, "0123456789"), [48, 49, 50, 51, 52, 53, 54, 55, 56, 57]);
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- text: <code>LZW(false, [48, 49, 50, 51, 52, 53, 54, 55, 56, 57])</code> should return <code>"0123456789"</code>.
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testString: assert.equal(LZW(false, [48, 49, 50, 51, 52, 53, 54, 55, 56, 57]), "0123456789");
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- text: <code>LZW(true, "BABAABAAA")</code> should return <code>[66, 65, 256, 257, 65, 260]</code>.
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testString: assert.deepEqual(LZW(true, "BABAABAAA"), [66, 65, 256, 257, 65, 260]);
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- text: <code>LZW(false, [66, 65, 256, 257, 65, 260])</code> should return <code>"BABAABAAA"</code>.
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testString: assert.equal(LZW(false, [66, 65, 256, 257, 65, 260]), "BABAABAAA");
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Write a function that takes two parameters. The first parameter is a boolean where \`true\` indicates compress and \`false\` indicates decompress. The second parameter is either a string or an array to be processed. If it is a string to be compressed, return an array of numbers. If it's an array of numbers to be decompressed, return a string.
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# --hints--
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`LZW` should be a function.
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```js
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assert(typeof LZW === 'function');
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```
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</section>
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`LZW(true, "TOBEORNOTTOBEORTOBEORNOT")` should return a array.
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## Challenge Seed
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<section id='challengeSeed'>
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```js
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assert(Array.isArray(LZW(true, 'TOBEORNOTTOBEORTOBEORNOT')));
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```
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<div id='js-seed'>
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`LZW(false, [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263])` should return a string.
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```js
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assert(
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typeof LZW(false, [
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84,
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79,
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66,
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69,
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79,
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82,
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78,
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79,
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84,
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256,
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258,
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260,
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265,
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259,
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261,
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263
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]) === 'string'
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);
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```
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`LZW(true, "TOBEORNOTTOBEORTOBEORNOT")` should return `[84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263]`.
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```js
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assert.deepEqual(LZW(true, 'TOBEORNOTTOBEORTOBEORNOT'), [
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84,
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79,
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66,
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69,
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79,
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82,
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78,
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79,
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84,
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256,
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258,
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260,
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265,
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259,
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261,
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263
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]);
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```
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`LZW(false, [84, 79, 66, 69, 79, 82, 78, 79, 84, 256, 258, 260, 265, 259, 261, 263])` should return `"TOBEORNOTTOBEORTOBEORNOT"`.
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```js
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assert.equal(
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LZW(false, [
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84,
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79,
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66,
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69,
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79,
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82,
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78,
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79,
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84,
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256,
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258,
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260,
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265,
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259,
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261,
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263
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]),
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'TOBEORNOTTOBEORTOBEORNOT'
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);
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```
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`LZW(true, "0123456789")` should return `[48, 49, 50, 51, 52, 53, 54, 55, 56, 57]`.
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```js
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assert.deepEqual(LZW(true, '0123456789'), [
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48,
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49,
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50,
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51,
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52,
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53,
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54,
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55,
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56,
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57
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]);
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```
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`LZW(false, [48, 49, 50, 51, 52, 53, 54, 55, 56, 57])` should return `"0123456789"`.
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```js
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assert.equal(
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LZW(false, [48, 49, 50, 51, 52, 53, 54, 55, 56, 57]),
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'0123456789'
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);
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```
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`LZW(true, "BABAABAAA")` should return `[66, 65, 256, 257, 65, 260]`.
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```js
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assert.deepEqual(LZW(true, 'BABAABAAA'), [66, 65, 256, 257, 65, 260]);
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```
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`LZW(false, [66, 65, 256, 257, 65, 260])` should return `"BABAABAAA"`.
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```js
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assert.equal(LZW(false, [66, 65, 256, 257, 65, 260]), 'BABAABAAA');
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```
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# --seed--
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## --seed-contents--
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```js
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function LZW (compressData, input) {
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@ -54,12 +151,7 @@ function LZW (compressData, input) {
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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# --solutions--
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```js
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function LZW (compressData, input) {
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@ -144,5 +236,3 @@ function LZW (compressData, input) {
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}
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}
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```
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</section>
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