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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@ -5,56 +5,123 @@ challengeType: 5
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forumTopicId: 302325
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---
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## Description
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# --description--
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<section id='description'>
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Implement functions to encrypt and decrypt a message using the [straddling checkerboard](https://en.wikipedia.org/wiki/Straddling_checkerboard) method. The functions will take a string and an array as parameters. The array has 3 strings representing the 3 rows of the checkerboard. The output will be a series of decimal digits. Numbers should be encrypted by inserting the escape character before each digit, then including the digit unencrypted. This should be reversed for decryption.
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Implement functions to encrypt and decrypt a message using the <a href="https://en.wikipedia.org/wiki/Straddling_checkerboard">straddling checkerboard</a> method. The functions will take a string and an array as parameters. The array has 3 strings representing the 3 rows of the checkerboard. The output will be a series of decimal digits.
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Numbers should be encrypted by inserting the escape character before each digit, then including the digit unencrypted. This should be reversed for decryption.
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# --hints--
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</section>
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`straddle` should be a function.
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>straddle</code> should be a function.
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testString: assert(typeof straddle == 'function');
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- text: <code>straddle("One night-it was on the twentieth of March, 1888-I was returning.",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])</code> should return a string.
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testString: assert(typeof straddle("One night-it was on the twentieth of March, 1888-I was returning.", ["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"]) == 'string');
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- text: <code>straddle("One night-it was on the twentieth of March, 1888-I was returning.",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])</code> should return <code>"34045747525284613427502840425027537379697175891898898898584619028294547488"</code>.
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testString: assert.equal(straddle("One night-it was on the twentieth of March, 1888-I was returning.", ["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"]), "34045747525284613427502840425027537379697175891898898898584619028294547488");
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- text: <code>straddle("One night-it was on the twentieth of March, 1888-I was returning",["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"])</code> should return <code>"139539363509369743061399059745399365901344308320791798798798367430685972839363935"</code>.
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testString: assert.equal(straddle("One night-it was on the twentieth of March, 1888-I was returning", ["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"]), "139539363509369743061399059745399365901344308320791798798798367430685972839363935");
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- text: <code>straddle("Thecheckerboardcakerecipespecifies3largeeggsand2.25cupsofflour.",["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."])</code> should return <code>"125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769"</code>.
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testString: assert.equal(straddle("Thecheckerboardcakerecipespecifies3largeeggsand2.25cupsofflour.", ["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."]), "125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769");
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- text: <code>unstraddle</code> should be a function.
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testString: assert(typeof unstraddle == 'function');
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- text: <code>unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])</code> should return a string.
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testString: assert(typeof unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488", ["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"]) == 'string');
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- text: <code>unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])</code> should return <code>"ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING."</code>.
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testString: assert.equal(unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488", ["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"]), "ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING.");
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- text: <code>unstraddle("139539363509369743061399059745399365901344308320791798798798367430685972839363935",["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"])</code> should return <code>"ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING"</code>.
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testString: assert.equal(unstraddle("139539363509369743061399059745399365901344308320791798798798367430685972839363935", ["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"]), "ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING");
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- text: <code>unstraddle("125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769",["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."])</code> should return <code>"THECHECKERBOARDCAKERECIPESPECIFIES3LARGEEGGSAND2.25CUPSOFFLOUR."</code>.
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testString: assert.equal(unstraddle("125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769", ["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."]), "THECHECKERBOARDCAKERECIPESPECIFIES3LARGEEGGSAND2.25CUPSOFFLOUR.");
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```js
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assert(typeof straddle == 'function');
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```
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</section>
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`straddle("One night-it was on the twentieth of March, 1888-I was returning.",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return a string.
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## Challenge Seed
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```js
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assert(
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typeof straddle(
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'One night-it was on the twentieth of March, 1888-I was returning.',
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['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
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) == 'string'
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);
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```
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<section id='challengeSeed'>
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`straddle("One night-it was on the twentieth of March, 1888-I was returning.",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return `"34045747525284613427502840425027537379697175891898898898584619028294547488"`.
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<div id='js-seed'>
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```js
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assert.equal(
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straddle(
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'One night-it was on the twentieth of March, 1888-I was returning.',
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['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
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),
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'34045747525284613427502840425027537379697175891898898898584619028294547488'
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);
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```
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`straddle("One night-it was on the twentieth of March, 1888-I was returning",["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"])` should return `"139539363509369743061399059745399365901344308320791798798798367430685972839363935"`.
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```js
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assert.equal(
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straddle('One night-it was on the twentieth of March, 1888-I was returning', [
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'HOL MES RT',
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'ABCDFGIJKN',
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'PQUVWXYZ./'
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]),
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'139539363509369743061399059745399365901344308320791798798798367430685972839363935'
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);
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```
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`straddle("Thecheckerboardcakerecipespecifies3largeeggsand2.25cupsofflour.",["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."])` should return `"125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769"`.
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```js
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assert.equal(
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straddle('Thecheckerboardcakerecipespecifies3largeeggsand2.25cupsofflour.', [
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'ET AON RIS',
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'BCDFGHJKLM',
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'PQ/UVWXYZ.'
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]),
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'125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769'
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);
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```
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`unstraddle` should be a function.
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```js
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assert(typeof unstraddle == 'function');
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```
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`unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return a string.
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```js
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assert(
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typeof unstraddle(
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'34045747525284613427502840425027537379697175891898898898584619028294547488',
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['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
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) == 'string'
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);
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```
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`unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return `"ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING."`.
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```js
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assert.equal(
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unstraddle(
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'34045747525284613427502840425027537379697175891898898898584619028294547488',
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['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
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),
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'ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING.'
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);
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```
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`unstraddle("139539363509369743061399059745399365901344308320791798798798367430685972839363935",["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"])` should return `"ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING"`.
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```js
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assert.equal(
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unstraddle(
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'139539363509369743061399059745399365901344308320791798798798367430685972839363935',
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['HOL MES RT', 'ABCDFGIJKN', 'PQUVWXYZ./']
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),
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'ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING'
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);
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```
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`unstraddle("125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769",["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."])` should return `"THECHECKERBOARDCAKERECIPESPECIFIES3LARGEEGGSAND2.25CUPSOFFLOUR."`.
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```js
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assert.equal(
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unstraddle(
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'125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769',
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['ET AON RIS', 'BCDFGHJKLM', 'PQ/UVWXYZ.']
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),
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'THECHECKERBOARDCAKERECIPESPECIFIES3LARGEEGGSAND2.25CUPSOFFLOUR.'
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);
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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 straddle(message, alphabet) {
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@ -66,12 +133,7 @@ function unstraddle(message, alphabet) {
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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 straddle(message, alphabet) {
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@ -121,5 +183,3 @@ function unstraddle(message, alphabet) {
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return out;
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}
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```
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</section>
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