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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@ -5,11 +5,9 @@ challengeType: 1
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forumTopicId: 301632
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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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In this exercise we are going to create a class named <code>Set</code> to emulate an abstract data structure called "set". A set is like an array, but it cannot contain duplicate values. The typical use for a set is to simply check for the presence of an item.
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We can see how the ES6 <code>Set</code> object works in the example below:
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In this exercise we are going to create a class named `Set` to emulate an abstract data structure called "set". A set is like an array, but it cannot contain duplicate values. The typical use for a set is to simply check for the presence of an item. We can see how the ES6 `Set` object works in the example below:
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```js
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const set1 = new Set([1, 2, 3, 5, 5, 2, 0]);
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@ -21,53 +19,136 @@ console.log(set1.has(6));
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// output: false
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```
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First, we will create an add method that adds a value to our set collection as long as the value does not already exist in the set.
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Then we will create a remove method that removes a value from the set collection if it already exists.
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And finally, we will create a size method that returns the number of elements inside the set collection.
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</section>
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First, we will create an add method that adds a value to our set collection as long as the value does not already exist in the set. Then we will create a remove method that removes a value from the set collection if it already exists. And finally, we will create a size method that returns the number of elements inside the set collection.
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## Instructions
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<section id='instructions'>
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# --instructions--
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Create an <code>add</code> method that adds a unique value to the set collection and returns <code>true</code> if the value was successfully added and <code>false</code> otherwise.
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Create an `add` method that adds a unique value to the set collection and returns `true` if the value was successfully added and `false` otherwise.
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Create a <code>remove</code> method that accepts a value and checks if it exists in the set. If it does, then this method should remove it from the set collection, and return <code>true</code>. Otherwise, it should return <code>false</code>.
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Create a <code>size</code> method that returns the size of the set collection.
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</section>
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Create a `remove` method that accepts a value and checks if it exists in the set. If it does, then this method should remove it from the set collection, and return `true`. Otherwise, it should return `false`. Create a `size` method that returns the size of the set collection.
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# --hints--
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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: Your <code>Set</code> class should have an <code>add</code> method.
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testString: assert((function(){var test = new Set(); return (typeof test.add === 'function')}()));
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- text: Your <code>add</code> method should not add duplicate values.
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testString: assert((function(){var test = new Set(); test.add('a'); test.add('b'); test.add('a'); var vals = test.values(); return (vals[0] === 'a' && vals[1] === 'b' && vals.length === 2)}()));
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- text: Your <code>add</code> method should return <code>true</code> when a value has been successfully added.
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testString: assert((function(){var test = new Set(); var result = test.add('a'); return (result != undefined) && (result === true);}()));
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- text: Your <code>add</code> method should return <code>false</code> when a duplicate value is added.
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testString: assert((function(){var test = new Set(); test.add('a'); var result = test.add('a'); return (result != undefined) && (result === false);}()));
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- text: Your <code>Set</code> class should have a <code>remove</code> method.
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testString: assert((function(){var test = new Set(); return (typeof test.remove === 'function')}()));
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- text: Your <code>remove</code> method should only remove items that are present in the set.
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testString: assert.deepEqual((function(){var test = new Set(); test.add('a');test.add('b');test.remove('c'); return test.values(); })(), ['a', 'b']);
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- text: Your <code>remove</code> method should remove the given item from the set.
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testString: assert((function(){var test = new Set(); test.add('a');test.add('b');test.remove('a'); var vals = test.values(); return (vals[0] === 'b' && vals.length === 1)}()));
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- text: Your <code>Set</code> class should have a <code>size</code> method.
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testString: assert((function(){var test = new Set(); return (typeof test.size === 'function')}()));
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- text: The <code>size</code> method should return the number of elements in the collection.
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testString: assert((function(){var test = new Set(); test.add('a');test.add('b');test.remove('a');return (test.size() === 1)}()));
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Your `Set` class should have an `add` method.
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```js
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assert(
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(function () {
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var test = new Set();
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return typeof test.add === 'function';
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})()
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);
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```
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</section>
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Your `add` method should not add duplicate values.
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## Challenge Seed
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<section id='challengeSeed'>
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```js
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assert(
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(function () {
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var test = new Set();
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test.add('a');
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test.add('b');
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test.add('a');
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var vals = test.values();
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return vals[0] === 'a' && vals[1] === 'b' && vals.length === 2;
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})()
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);
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```
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<div id='js-seed'>
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Your `add` method should return `true` when a value has been successfully added.
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```js
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assert(
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(function () {
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var test = new Set();
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var result = test.add('a');
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return result != undefined && result === true;
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})()
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);
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```
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Your `add` method should return `false` when a duplicate value is added.
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```js
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assert(
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(function () {
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var test = new Set();
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test.add('a');
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var result = test.add('a');
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return result != undefined && result === false;
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})()
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);
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```
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Your `Set` class should have a `remove` method.
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```js
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assert(
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(function () {
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var test = new Set();
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return typeof test.remove === 'function';
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})()
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);
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```
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Your `remove` method should only remove items that are present in the set.
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```js
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assert.deepEqual(
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(function () {
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var test = new Set();
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test.add('a');
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test.add('b');
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test.remove('c');
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return test.values();
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})(),
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['a', 'b']
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);
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```
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Your `remove` method should remove the given item from the set.
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```js
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assert(
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(function () {
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var test = new Set();
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test.add('a');
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test.add('b');
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test.remove('a');
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var vals = test.values();
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return vals[0] === 'b' && vals.length === 1;
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})()
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);
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```
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Your `Set` class should have a `size` method.
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```js
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assert(
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(function () {
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var test = new Set();
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return typeof test.size === 'function';
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})()
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);
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```
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The `size` method should return the number of elements in the collection.
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```js
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assert(
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(function () {
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var test = new Set();
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test.add('a');
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test.add('b');
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test.remove('a');
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return test.size() === 1;
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})()
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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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class Set {
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@ -93,12 +174,7 @@ class Set {
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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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class Set {
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@ -140,5 +216,3 @@ class Set {
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}
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}
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```
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</section>
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