95 lines
		
	
	
		
			4.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			95 lines
		
	
	
		
			4.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
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								---
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								id: 587d8251367417b2b2512c63
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								title: Remove Elements from a Linked List
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								challengeType: 1
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								videoUrl: ''
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								localeTitle: 从链接列表中删除元素
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								---
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								## Description
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								<section id="description">链接列表的任何实现所需的下一个重要方法是<code>remove</code>方法。此方法应将要删除的元素作为参数,然后搜索列表以查找并删除包含该元素的节点。每当我们从链表中删除一个节点时,重要的是我们不要意外地孤立列表的其余部分。回想一下,每个节点的<code>next</code>属性都指向列表中跟随它的节点。如果我们删除中间元素,比如说,我们要确保我们从该元素的前一个节点的<code>next</code>属性到中间元素的<code>next</code>属性(这是列表中的下一个节点)的连接!这可能听起来真的很混乱,所以让我们回到康加线的例子,这样我们就有了一个很好的概念模型。想象自己在康加舞线上,直接在你面前的人离开了这条线。刚离开生产线的人不再将手放在任何人身上 - 而且你不再把手放在离开的人身上。你向前走,把你的手放在你看到的下一个人身上。如果我们要删除的元素是<code>head</code>元素,我们将<code>head</code>重新分配给链表的第二个节点。 </section>
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								## Instructions
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								<section id="instructions">编写一个<code>remove</code>方法,该方法接受一个元素并将其从链表中删除。注意每次从链接列表中删除元素时,列表的<code>length</code>应减少一。 </section>
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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: 您的<code>LinkedList</code>类应该有一个<code>remove</code>方法。
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								    testString: 'assert((function(){var test = new LinkedList(); return (typeof test.remove === "function")}()), "Your <code>LinkedList</code> class should have a <code>remove</code> method.");'
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								  - text: <code>remove</code>第一个节点时, <code>remove</code>方法应重新分配<code>head</code>到第二个节点。
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								    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.remove("cat"); return test.head().element === "dog"}()), "Your <code>remove</code> method should reassign <code>head</code> to the second node when the first node is removed.");'
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								  - text: 对于每个删除的节点,您的<code>remove</code>方法应该将链表的<code>length</code>减少一个。
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								    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.remove("cat"); return test.size() === 1})(), "Your <code>remove</code> method should decrease the <code>length</code> of the linked list by one for every node removed.");'
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								  - text: 您的<code>remove</code>方法应该将已删除节点的上<code>next</code>节点的引用重新分配给已删除节点的<code>next</code>引用。
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								    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog");test.add("kitten"); test.remove("dog"); return test.head().next.element === "kitten"})(), "Your <code>remove</code> method should reassign the reference of the previous node of the removed node to the removed node's <code>next</code> reference.");'
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								```
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								</section>
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								## Challenge Seed
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								<section id='challengeSeed'>
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								<div id='js-seed'>
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								```js
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								function LinkedList() {
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								  var length = 0;
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								  var head = null;
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								  var Node = function(element){
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								    this.element = element;
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								    this.next = null;
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								  };
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								  this.size = function(){
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								    return length;
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								  };
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								  this.head = function(){
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								    return head;
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								  };
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								  this.add = function(element){
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								    var node = new Node(element);
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								    if(head === null){
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								        head = node;
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								    } else {
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								        currentNode = head;
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								        while(currentNode.next){
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								            currentNode  = currentNode.next;
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								        }
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								        currentNode.next = node;
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								    }
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								    length++;
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								  };
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								  this.remove = function(element){
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								    // Only change code below this line
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								    // Only change code above this line
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								  };
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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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								```js
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								// solution required
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								```
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								</section>
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