1var assert = require("assert");
2
3class Hashmap {
4  constructor() {
5    this._storage = [];
6  }
7
8  hashStr(str) {
9    let finalHash = 0;
10    for (let i = 0; i < str.length; i++) {
11      const charCode = str.charCodeAt(i);
12      finalHash += charCode;
13    }
14    return finalHash;
15  }
16
17  set(key, val) {
18    let idx = this.hashStr(key);
19
20    if (!this._storage[idx]) {
21      this._storage[idx] = [];
22    }
23
24    this._storage[idx].push([key, val]);
25  }
26
27  get(key) {
28    let idx = this.hashStr(key);
29
30    if (!this._storage[idx]) {
31      return undefined;
32    }
33
34    for (let keyVal of this._storage[idx]) {
35      if (keyVal[0] === key) {
36        return keyVal[1];
37      }
38    }
39  }
40}
41
42try {
43  var dict = new Hashmap();
44  dict.set("james", "123-456-7890");
45  dict.set("jess", "213-559-6840");
46  assert.equal(dict.get("james"), "123-456-7890");
47
48  console.log(
49    "PASSED: " +
50      "`var dict = new Hashmap(); dict.set('jess', '213-559-6840'); dict.set('james', '123-456-7890'); dict.get('james')` should return `'123-456-7890'`"
51  );
52} catch (err) {
53  console.log(err);
54}
55
56try {
57  assert.equal(dict.get("jake"), undefined);
58
59  console.log(
60    "PASSED: " +
61      "`var dict = new Hashmap(); dict.set('jess', '213-559-6840'); dict.set('james', '123-456-7890'); dict.get('jake')` should return `undefined`"
62  );
63} catch (err) {
64  console.log(err);
65}
66
67try {
68  assertIsFunction(dict.set, "Hashmap class has a `set` method");
69
70  console.log("PASSED: " + "Hashmap class has a `set` method");
71} catch (err) {
72  console.log(err);
73}
74
75try {
76  assertIsFunction(dict.get, "Hashmap class has a `get` method");
77
78  console.log("PASSED: " + "Hashmap class has a `get` methods");
79} catch (err) {
80  console.log(err);
81}
82
83function assertIsFunction(f) {
84  return typeof f === "function";
85}