如何解决修改引用值而不是引用值
let bst = new class BinarySearchTree {
constructor() {
this.root = null;
}
insert(value) {
let newNode = new Node(value);
let current = this.root; //this doesn't assign current as a reference,instead it assigns it to null
let left = (current?.left) ? current.left : null;
let right = (current?.right) ? current.right : null;
while (current) {
current = (newNode.value <= current.value) ? left : right;
left = (current?.left) ? current.left : null;
right = (current?.left) ? current.right : null;
}
current = newNode; //this line assigns current to reference
return current;
}
我使用 current
来引用当前节点。问题是当我尝试将 current
的值设置为 newNode 时,它不会将该值分配给 current
所引用的内容(我假设是因为它不是引用)。相反,它将 current
设置为引用 newNode
。是否可以将 current 设置为对 this.root
which = null
的实际引用。
插入就是这样调用的
bst.insert(250);
这里是 Node 类:
class Node {
constructor(value) {
this.value = value;
this.right = null;
this.left = null;
}
}
解决方法
let bst = new class BinarySearchTree {
constructor() {
this.root = null;
}
insert(value) {
let newNode = new Node(value);
let current = this.root;
let left = current?.left
let right = current?.right
while (current) {
//your code will never reach here until second call
current = (newNode.value <= current.value) ? left : right;
left = (current?.left) ? current.left : null;
right = (current?.left) ? current.right : null;
}
this.root = newNode;//setting current will not effect this.root,so you will not be able to reach current on next call if you not use like this
return current;
}
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