2018-10-10 22:03:03 +00:00
|
|
|
|
---
|
|
|
|
|
id: 595011cba5a81735713873bd
|
|
|
|
|
challengeType: 5
|
|
|
|
|
videoUrl: ''
|
2020-10-01 15:54:21 +00:00
|
|
|
|
title: 每组排名最高
|
2018-10-10 22:03:03 +00:00
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
## Description
|
|
|
|
|
<section id="description">任务: <p>在每个组中查找排名前N位的数据,其中N作为参数提供。等级和组的名称也作为参数提供。 </p>鉴于以下数据: <pre> [
|
|
|
|
|
{姓名:'Tyler Bennett',id:'E10297',薪水:32000,部门:'D101'},
|
|
|
|
|
{姓名:'John Rappl',id:'E21437',薪水:47000,部门:'D050'},
|
|
|
|
|
{姓名:'George Woltman',id:'E00127',薪水:53500,部门:'D101'},
|
|
|
|
|
{name:'Adam Smith',id:'E63535',薪水:18000,部门:'D202'},
|
|
|
|
|
{姓名:'Claire Buckman',id:'E39876',薪水:27800,部门:'D202'},
|
|
|
|
|
{姓名:'David McClellan',id:'E04242',薪水:41500,部门:'D101'},
|
|
|
|
|
{name:'Rich Holcomb',id:'E01234',薪水:49500,dept:'D202'},
|
|
|
|
|
{姓名:'Nathan Adams',id:'E41298',薪水:21900,部门:'D050'},
|
|
|
|
|
{姓名:'Richard Potter',id:'E43128',薪水:15900,部门:'D101'},
|
|
|
|
|
{姓名:'David Motsinger',id:'E27002',薪水:19250,dept:'D202'},
|
|
|
|
|
{姓名:'Tim Sampair',id:'E03033',薪水:27000,部门:'D101'},
|
|
|
|
|
{姓名:'Kim Arlich',id:'E10001',薪水:57000,部门:'D190'},
|
|
|
|
|
{name:'Timothy Grove',id:'E16398',薪水:29900,部门:'D190'}
|
|
|
|
|
]。
|
|
|
|
|
</pre>通过调用<code>topRankPerGroup(10, data, 'dept', 'salary')</code>可以对每个部门的前10名员工进行排名。给出以下数据: <pre> [
|
|
|
|
|
{name:'Friday 13th',类型:'恐怖',评分:9.9},
|
|
|
|
|
{姓名:“榆树街上的梦魇”,类型:'恐怖',等级:5.7},
|
|
|
|
|
{name:'Titanic',类型:'drama',评分:7.3},
|
|
|
|
|
{name:'Maze Runner',类型:'scifi',评级:7.1},
|
|
|
|
|
{name:'Blade runner',类型:'scifi',评分:8.9}
|
|
|
|
|
]。
|
|
|
|
|
</pre>通过调用<code>topRankPerGroup(1, data, 'genre', 'rating')</code>可以在每个类型中对排名最高的电影进行排名</section>
|
|
|
|
|
|
|
|
|
|
## Instructions
|
|
|
|
|
<section id="instructions">
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Tests
|
|
|
|
|
<section id='tests'>
|
|
|
|
|
|
|
|
|
|
```yml
|
|
|
|
|
tests:
|
|
|
|
|
- text: <code>topRankPerGroup</code>是一个函数。
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert(typeof topRankPerGroup === 'function');
|
2018-10-10 22:03:03 +00:00
|
|
|
|
- text: <code>topRankPerGroup</code>在负n值上返回undefined。
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert(typeof topRankPerGroup(-1, []) === 'undefined');
|
2018-10-10 22:03:03 +00:00
|
|
|
|
- text: 第一部门必须是D050
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert.equal(res1[0][0].dept, 'D050');
|
2018-10-10 22:03:03 +00:00
|
|
|
|
- text: 第一部门必须是D050
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert.equal(res1[0][1].salary, 21900);
|
2018-10-10 22:03:03 +00:00
|
|
|
|
- text: 最后一个部门必须是D202
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert.equal(res1[3][3].dept, 'D202');
|
2018-10-10 22:03:03 +00:00
|
|
|
|
- text: '<code>topRankPerGroup(1, ...)</code>必须仅返回每组的排名最高的结果。'
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert.equal(res2[2].length, 1);
|
2018-10-10 22:03:03 +00:00
|
|
|
|
- text: '<code>topRankPerGroup(1, ...)</code>必须仅返回每组的排名最高的结果。'
|
2020-02-17 16:40:55 +00:00
|
|
|
|
testString: assert.equal(res3[2][1].name, 'Maze Runner');
|
2018-10-10 22:03:03 +00:00
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Challenge Seed
|
|
|
|
|
<section id='challengeSeed'>
|
|
|
|
|
|
|
|
|
|
<div id='js-seed'>
|
|
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
function topRankPerGroup(n, data, groupName, rankName) {
|
|
|
|
|
// Good luck!
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### After Test
|
|
|
|
|
<div id='js-teardown'>
|
|
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
console.info('after the test');
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Solution
|
|
|
|
|
<section id='solution'>
|
|
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
// solution required
|
|
|
|
|
```
|
2020-08-13 15:24:35 +00:00
|
|
|
|
|
|
|
|
|
/section>
|