63 lines
2.0 KiB
Markdown
63 lines
2.0 KiB
Markdown
|
---
|
|||
|
id: 587d7b88367417b2b2512b44
|
|||
|
title: Write Arrow Functions with Parameters
|
|||
|
challengeType: 1
|
|||
|
videoUrl: ''
|
|||
|
localeTitle: 用参数写箭头函数
|
|||
|
---
|
|||
|
|
|||
|
## Description
|
|||
|
<section id="description">就像普通函数一样,您可以将参数传递给箭头函数。 <blockquote> //将输入值加倍并返回<br> const doubler =(item)=> item * 2; </blockquote>您也可以将多个参数传递给箭头函数。 </section>
|
|||
|
|
|||
|
## Instructions
|
|||
|
<section id="instructions">重写<code>myConcat</code>函数,该函数将<code>arr2</code>内容追加到<code>arr1</code>以便该函数使用箭头函数语法。 </section>
|
|||
|
|
|||
|
## Tests
|
|||
|
<section id='tests'>
|
|||
|
|
|||
|
```yml
|
|||
|
tests:
|
|||
|
- text: 用户确实替换了<code>var</code>关键字。
|
|||
|
testString: 'getUserInput => assert(!getUserInput("index").match(/var/g), "User did replace <code>var</code> keyword.");'
|
|||
|
- text: <code>myConcat</code>应该是一个常量变量(使用<code>const</code> )。
|
|||
|
testString: 'getUserInput => assert(getUserInput("index").match(/const\s+myConcat/g), "<code>myConcat</code> should be a constant variable (by using <code>const</code>).");'
|
|||
|
- text: <code>myConcat</code>应该是一个函数
|
|||
|
testString: 'assert(typeof myConcat === "function", "<code>myConcat</code> should be a function");'
|
|||
|
- text: <code>myConcat()</code>返回正确的<code>array</code>
|
|||
|
testString: 'assert(() => { const a = myConcat([1], [2]); return a[0] == 1 && a[1] == 2; }, "<code>myConcat()</code> returns the correct <code>array</code>");'
|
|||
|
- text: <code>function</code>关键字未使用。
|
|||
|
testString: 'getUserInput => assert(!getUserInput("index").match(/function/g), "<code>function</code> keyword was not used.");'
|
|||
|
|
|||
|
```
|
|||
|
|
|||
|
</section>
|
|||
|
|
|||
|
## Challenge Seed
|
|||
|
<section id='challengeSeed'>
|
|||
|
|
|||
|
<div id='js-seed'>
|
|||
|
|
|||
|
```js
|
|||
|
var myConcat = function(arr1, arr2) {
|
|||
|
"use strict";
|
|||
|
return arr1.concat(arr2);
|
|||
|
};
|
|||
|
// test your code
|
|||
|
console.log(myConcat([1, 2], [3, 4, 5]));
|
|||
|
|
|||
|
```
|
|||
|
|
|||
|
</div>
|
|||
|
|
|||
|
|
|||
|
|
|||
|
</section>
|
|||
|
|
|||
|
## Solution
|
|||
|
<section id='solution'>
|
|||
|
|
|||
|
```js
|
|||
|
// solution required
|
|||
|
```
|
|||
|
</section>
|