链表

1
const a = {val: 'a'}
2
const b = {val: 'b'}
3
const c = {val: 'c'}
4
const d = {val: 'd'}
5
a.next = b
6
b.next = c
7
c.next = d
8

9
let p = a
10
while (p){
11
    console.log(p.val)
12
    p = p.next
13
}

1
const e = {val: 'e'}
2
b.next = e
3
e.next = c

1
b.next = c

1
const json = { a: { b: 'hello' }, c: [1, 2] };
2
const path = ['a', 'b'];
3
let point = json;
4
path.forEach(key => { point = point[key] });