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fix(learn): make tests and test descriptions more explicit (#41281) 

* fix: make tests and descriptions more explicit

* fix: add example to description

* fix: replace pre tags with markdown

* fix: move test data to seed code for convenience

* fix: correct grammar from review

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>

* Revert "fix: move test data to seed code for convenience"

This reverts commit 7a9c4723d6.

* fix: small corrections

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/top-rank-per-group.md
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@ -12,7 +12,8 @@ Find the top `n` ranked data in each group, where `n` is provided as a parameter
Given the following data:
<pre>[
```js
testData1 = [
{ name: 'Tyler Bennett', id: 'E10297', salary: 32000, dept: 'D101' },
{ name: 'John Rappl', id: 'E21437', salary: 47000, dept: 'D050' },
{ name: 'George Woltman', id: 'E00127', salary: 53500, dept: 'D101' },
@ -27,29 +28,52 @@ Given the following data:
{ name: 'Kim Arlich', id: 'E10001', salary: 57000, dept: 'D190' },
{ name: 'Timothy Grove', id: 'E16398', salary: 29900, dept: 'D190' }
];
</pre>
```
one could rank top 10 employees in each department by calling
One could rank top 10 employees in each department by calling:
`topRankPerGroup(10, data, 'dept', 'salary')`
`topRankPerGroup(10, testData1, 'dept', 'salary')`
Given the following data:
<pre>[
```js
testData2 = [
{ name: 'Friday 13th', genre: 'horror', rating: 9.9 },
{ name: "Nightmare on Elm's Street", genre: 'horror', rating: 5.7 },
{ name: 'Titanic', genre: 'drama', rating: 7.3 },
{ name: 'Maze Runner', genre: 'scifi', rating: 7.1 },
{ name: 'Blade runner', genre: 'scifi', rating: 8.9 }
];
</pre>
```
one could rank the top-rated movie in each genre by calling
One could rank the top-rated movie in each genre by calling:
`topRankPerGroup(1, data, 'genre', 'rating')`
`topRankPerGroup(1, testData2, 'genre', 'rating')`
The function should return an array with an array for each group containing the top `n` objects.
For example, given data:
```js
[
{ name: 'Claire Buckman', id: 'E39876', salary: 27800, dept: 'D101' },
{ name: 'Rich Holcomb', id: 'E01234', salary: 49500, dept: 'D050' },
{ name: 'David Motsinger', id: 'E27002', salary: 19250, dept: 'D050' },
{ name: 'Tim Sampair', id: 'E03033', salary: 27000, dept: 'D101' },
{ name: 'Kim Arlich', id: 'E10001', salary: 57000, dept: 'D050' },
{ name: 'Timothy Grove', id: 'E16398', salary: 29900, dept: 'D101' }
];
```
Top two ranking employees in each department by salary would be:
```js
[ [ { name: 'Kim Arlich', id: 'E10001', salary: 57000, dept: 'D050' },
{ name: 'Rich Holcomb', id: 'E01234', salary: 49500, dept: 'D050' } ],
[ { name: 'Timothy Grove', id: 'E16398', salary: 29900, dept: 'D101' },
{ name: 'Claire Buckman', id: 'E39876', salary: 27800, dept: 'D101' } ] ]
```
# --hints--
`topRankPerGroup` should be a function.
@ -64,22 +88,16 @@ assert(typeof topRankPerGroup === 'function');
assert(typeof topRankPerGroup(-1, []) === 'undefined');
```
First department should be D050
For `topRankPerGroup(10, testData1, 'dept', 'salary')`, the first result in the first group should be `{ name: 'John Rappl', id: 'E21437', salary: 47000, dept: 'D050'}`.
```js
assert.equal(res1[0][0].dept, 'D050');
assert.deepEqual(res1[0][0], { name: 'John Rappl', id: 'E21437', salary: 47000, dept: 'D050'});
```
First department should be D050
For `topRankPerGroup(10, testData1, 'dept', 'salary')`, the last result in the last group should be `{ name: 'Adam Smith', id: 'E63535', salary: 18000, dept: 'D202' }`.
```js
assert.equal(res1[0][1].salary, 21900);
```
The last department should be D202
```js
assert.equal(res1[3][3].dept, 'D202');
assert.deepEqual(res1[3][3], { name: 'Adam Smith', id: 'E63535', salary: 18000, dept: 'D202' });
```
`topRankPerGroup(1, ...)` should return only top ranking result per group.
@ -88,7 +106,7 @@ assert.equal(res1[3][3].dept, 'D202');
assert.equal(res2[2].length, 1);
```
`topRankPerGroup(1, ...)` should return only top ranking result per group.
`topRankPerGroup(2, ...)` should return two ranking results per group.
```js
assert.equal(res3[2][1].name, 'Maze Runner');