英文:
Why variable doesn't clear its value
问题
以下是翻译好的部分：
为什么以下代码没有删除 secondList 变量的值？
let secondList = list.next.next;
list.next.next = null;
secondList 不应该引用与我们分配 null 的同一个对象吗？
英文:
I have next code:
let list = {
value: 1,
next: {
value: 2,
next: {
value: 3,
next: {
value: 4,
next: null
}
}
}
};
Why doesn't the following code delete the value of the secondList variable?
let secondList = list.next.next;
list.next.next = null;
Shouldn't the secondList have reference to the same object to which we assigned null?
答案1
得分: 2
list.next.next的值是对一个对象的引用。
let secondList = list.next.next;将对该对象的引用复制到secondList。
list.next.next = null将原始对象的引用替换为null。
它不会删除或修改对象本身。secondList的值保持不变。由于仍然存在对对象的引用（在secondList中），因此对象不会被垃圾回收。
英文:
The value of list.next.next is a reference to an object.
let secondList = list.next.next; copies the reference to that object to secondList.
list.next.next = null replaces the original reference to the object with null.
It doesn't delete or modify the object itself. The value of secondList is unchanged. Since there remains a reference to the object (in secondList), the object is not garbage collected.
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