1var assert = require('assert');
2
3var lengthOfLongestSubstring = function (s) {
4  var startNum = 0,
5    maximumLen = 0;
6  var map = new Map();
7
8  for (var i = 0; i < s.length; i++) {
9    var ch = s[i];
10
11    if (map.get(ch) >= startNum) startNum = map.get(ch) + 1;
12    map.set(ch, i);
13
14    if (i - startNum + 1 > maximumLen) maximumLen = i - startNum + 1;
15  }
16
17  return maximumLen;
18};
19
20try {
21  assert.equal(lengthOfLongestSubstring('algodaily'), 7);
22
23  console.log(
24    'PASSED: ' +
25      "`lengthOfLongestSubstring('algodaily')` should be equal to `7`"
26  );
27} catch (err) {
28  console.log(err);
29}
30
31try {
32  assert.equal(lengthOfLongestSubstring('thisisatest'), 5);
33
34  console.log(
35    'PASSED: ' +
36      "`lengthOfLongestSubstring('thisisatest')` should be equal to `5`"
37  );
38} catch (err) {
39  console.log(err);
40}
41
42try {
43  assert.equal(lengthOfLongestSubstring('rosesarered'), 4);
44
45  console.log(
46    'PASSED: ' +
47      "`lengthOfLongestSubstring('rosesarered')` should be equal to `4`"
48  );
49} catch (err) {
50  console.log(err);
51}