1var assert = require('assert');
2
3function zerosToEnd(nums) {
4  let insertPos = 0;
5  for (let i = 0; i < nums.length; i++) {
6    if (nums[i] != 0) {
7      nums[insertPos++] = nums[i];
8    }
9  }
10
11  for (let j = insertPos; j < nums.length; j++) {
12    nums[j] = 0;
13  }
14
15  return nums;
16}
17
18console.log(zerosToEnd([1, 0, 2, 0, 4, 0]));
19
20try {
21  assert.deepEqual(zerosToEnd([1, 0, 2, 0, 4, 0]), [1, 2, 4, 0, 0, 0]);
22
23  console.log(
24    'PASSED: `zerosToEnd([1, 0, 2, 0, 4, 0])` should get us `[1, 2, 4, 0, 0, 0]`'
25  );
26} catch (err) {
27  console.log(err);
28}
29
30try {
31  assert.deepEqual(
32    zerosToEnd([4, 13, 0, 2, 0, 0, 15, 0]),
33    [4, 13, 2, 15, 0, 0, 0, 0]
34  );
35
36  console.log(
37    'PASSED: `zerosToEnd([4, 13, 0, 2, 0, 0, 15, 0])` should get us `[4, 13, 2, 15, 0, 0, 0, 0]`'
38  );
39} catch (err) {
40  console.log(err);
41}
42
43try {
44  assert.deepEqual(zerosToEnd([0]), [0]);
45
46  console.log('PASSED: ' + '`zerosToEnd([0])` should get us `[0]`');
47} catch (err) {
48  console.log(err);
49}
50
51try {
52  assert.deepEqual(zerosToEnd([]), []);
53
54  console.log('PASSED: ' + '`zerosToEnd([])` should get us `[]`');
55} catch (err) {
56  console.log(err);
57}