add: 链表排序

test/list/sort-list.test.js

@@ -0,0 +1,31 @@
+import { sortList } from '../../src/list/sort-list'
+
+function ListNode (val) {
+  this.val = val
+  this.next = null
+}
+
+const arrToList = (arr) => {
+  const head = new ListNode(arr[0])
+  let current = head
+  for (let n = 1, len = arr.length; n < len; n++) {
+    current.next = new ListNode(arr[n])
+    current = current.next
+  }
+
+  return head
+}
+
+test('链表排序', () => {
+  const source = [4, 2, 1, 3]
+  expect(sortList(arrToList(source))).toEqual(arrToList(source.sort((a, b) => a - b)))
+
+  const source2 = [-1, 5, 3, 4, 0]
+  expect(sortList(arrToList(source2))).toEqual(arrToList(source2.sort((a, b) => a - b)))
+
+  const source3 = [1, 3, 2, null]
+  expect(sortList(arrToList(source3))).toEqual(arrToList([1, 2, 3]))
+
+  const source4 = [1, 7, 2, 6, null]
+  expect(sortList(arrToList(source4))).toEqual(arrToList([1, 2, 6, 7]))
+})