59 lines
		
	
	
		
			2.3 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			59 lines
		
	
	
		
			2.3 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
|   | --- | |||
|  | id: 587d7b7b367417b2b2512b17 | |||
|  | title: Combine Arrays with the Spread Operator | |||
|  | challengeType: 1 | |||
|  | videoUrl: '' | |||
|  | localeTitle: 将数组与Spread运算符组合在一起 | |||
|  | --- | |||
|  | 
 | |||
|  | ## Description
 | |||
|  | <section id="description"> <dfn>扩展</dfn>运算符的另一个巨大优势是能够组合数组,或者在任何索引处将一个数组的所有元素插入到另一个数组中。使用更传统的语法,我们可以连接数组,但这只允许我们在一个数组的末尾和另一个数组的开头组合数组。 Spread语法使以下操作非常简单: <blockquote>让thisArray = ['sage','迷迭香','欧芹','百里香']; <br><br>让那个阵容= ['罗勒','香菜',......这个阿雷,'香菜']; <br> //现在等于['罗勒','香菜','鼠尾草','迷迭香','欧芹','百里香','香菜'] </blockquote>使用扩展语法,我们刚刚实现了一个操作,如果我们使用传统方法,这个操作会更复杂,更冗长。 </section> | |||
|  | 
 | |||
|  | ## Instructions
 | |||
|  | <section id="instructions">我们定义了一个函数<code>spreadOut</code> ,它返回变量<code>sentence</code> ,使用<dfn>spread</dfn>运算符修改函数,使它返回数组<code>['learning', 'to', 'code', 'is', 'fun']</code> 。 </section> | |||
|  | 
 | |||
|  | ## Tests
 | |||
|  | <section id='tests'> | |||
|  | 
 | |||
|  | ```yml | |||
|  | tests: | |||
|  |   - text: '<code>spreadOut</code>应该返回<code>["learning", "to", "code", "is", "fun"]</code>' | |||
|  |     testString: 'assert.deepEqual(spreadOut(), ["learning", "to", "code", "is", "fun"], "<code>spreadOut</code> should return <code>["learning", "to", "code", "is", "fun"]</code>");' | |||
|  |   - text: <code>spreadOut</code>函数应该使用扩展语法 | |||
|  |     testString: 'assert.notStrictEqual(spreadOut.toString().search(/[...]/), -1, "The <code>spreadOut</code> function should utilize spread syntax");' | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Challenge Seed
 | |||
|  | <section id='challengeSeed'> | |||
|  | 
 | |||
|  | <div id='js-seed'> | |||
|  | 
 | |||
|  | ```js | |||
|  | function spreadOut() { | |||
|  |   let fragment = ['to', 'code']; | |||
|  |   let sentence; // change this line | |||
|  |   return sentence; | |||
|  | } | |||
|  | 
 | |||
|  | // do not change code below this line | |||
|  | console.log(spreadOut()); | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </div> | |||
|  | 
 | |||
|  | 
 | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Solution
 | |||
|  | <section id='solution'> | |||
|  | 
 | |||
|  | ```js | |||
|  | // solution required | |||
|  | ``` | |||
|  | </section> |