3.1 KiB
3.1 KiB
id | title | challengeType | videoUrl | localeTitle |
---|---|---|---|---|
587d8252367417b2b2512c67 | Add Elements at a Specific Index in a Linked List | 1 | 在链接列表中的特定索引处添加元素 |
Description
Instructions
Tests
tests:
- text: 当给定索引为0时, <code>addAt</code>方法应重新分配<code>head</code>到新节点。
testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.addAt(0,"cat"); return test.head().element === "cat"}()), "Your <code>addAt</code> method should reassign <code>head</code> to the new node when the given index is 0.");'
- text: 对于添加到链接列表的每个新节点, <code>addAt</code>方法应该将链表的长度增加一。
testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.addAt(0,"cat"); return test.size() === 3}()), "Your <code>addAt</code> method should increase the length of the linked list by one for each new node added to the linked list.");'
- text: 如果无法添加节点,则<code>addAt</code>方法应返回<code>false</code> 。
testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); return (test.addAt(4,"cat") === false); }()), "Your <code>addAt</code> method should return <code>false</code> if a node was unable to be added.");'
Challenge Seed
function LinkedList() {
var length = 0;
var head = null;
var Node = function(element){
this.element = element;
this.next = null;
};
this.size = function(){
return length;
};
this.head = function(){
return head;
};
this.add = function(element){
var node = new Node(element);
if(head === null){
head = node;
} else {
currentNode = head;
while(currentNode.next){
currentNode = currentNode.next;
}
currentNode.next = node;
}
length++;
};
// Only change code below this line
// Only change code above this line
}
Solution
// solution required