|
|
/**
|
|
|
* File: array_hash_map.js
|
|
|
* Created Time: 2022-12-26
|
|
|
* Author: Justin (xiefahit@gmail.com)
|
|
|
*/
|
|
|
|
|
|
/* 鍵值對 Number -> String */
|
|
|
class Pair {
|
|
|
constructor(key, val) {
|
|
|
this.key = key;
|
|
|
this.val = val;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* 基於陣列實現的雜湊表 */
|
|
|
class ArrayHashMap {
|
|
|
#buckets;
|
|
|
constructor() {
|
|
|
// 初始化陣列，包含 100 個桶
|
|
|
this.#buckets = new Array(100).fill(null);
|
|
|
}
|
|
|
|
|
|
/* 雜湊函式 */
|
|
|
#hashFunc(key) {
|
|
|
return key % 100;
|
|
|
}
|
|
|
|
|
|
/* 查詢操作 */
|
|
|
get(key) {
|
|
|
let index = this.#hashFunc(key);
|
|
|
let pair = this.#buckets[index];
|
|
|
if (pair === null) return null;
|
|
|
return pair.val;
|
|
|
}
|
|
|
|
|
|
/* 新增操作 */
|
|
|
set(key, val) {
|
|
|
let index = this.#hashFunc(key);
|
|
|
this.#buckets[index] = new Pair(key, val);
|
|
|
}
|
|
|
|
|
|
/* 刪除操作 */
|
|
|
delete(key) {
|
|
|
let index = this.#hashFunc(key);
|
|
|
// 置為 null ，代表刪除
|
|
|
this.#buckets[index] = null;
|
|
|
}
|
|
|
|
|
|
/* 獲取所有鍵值對 */
|
|
|
entries() {
|
|
|
let arr = [];
|
|
|
for (let i = 0; i < this.#buckets.length; i++) {
|
|
|
if (this.#buckets[i]) {
|
|
|
arr.push(this.#buckets[i]);
|
|
|
}
|
|
|
}
|
|
|
return arr;
|
|
|
}
|
|
|
|
|
|
/* 獲取所有鍵 */
|
|
|
keys() {
|
|
|
let arr = [];
|
|
|
for (let i = 0; i < this.#buckets.length; i++) {
|
|
|
if (this.#buckets[i]) {
|
|
|
arr.push(this.#buckets[i].key);
|
|
|
}
|
|
|
}
|
|
|
return arr;
|
|
|
}
|
|
|
|
|
|
/* 獲取所有值 */
|
|
|
values() {
|
|
|
let arr = [];
|
|
|
for (let i = 0; i < this.#buckets.length; i++) {
|
|
|
if (this.#buckets[i]) {
|
|
|
arr.push(this.#buckets[i].val);
|
|
|
}
|
|
|
}
|
|
|
return arr;
|
|
|
}
|
|
|
|
|
|
/* 列印雜湊表 */
|
|
|
print() {
|
|
|
let pairSet = this.entries();
|
|
|
for (const pair of pairSet) {
|
|
|
console.info(`${pair.key} -> ${pair.val}`);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* Driver Code */
|
|
|
/* 初始化雜湊表 */
|
|
|
const map = new ArrayHashMap();
|
|
|
/* 新增操作 */
|
|
|
// 在雜湊表中新增鍵值對 (key, value)
|
|
|
map.set(12836, '小哈');
|
|
|
map.set(15937, '小囉');
|
|
|
map.set(16750, '小算');
|
|
|
map.set(13276, '小法');
|
|
|
map.set(10583, '小鴨');
|
|
|
console.info('\n新增完成後，雜湊表為\nKey -> Value');
|
|
|
map.print();
|
|
|
|
|
|
/* 查詢操作 */
|
|
|
// 向雜湊表中輸入鍵 key ，得到值 value
|
|
|
let name = map.get(15937);
|
|
|
console.info('\n輸入學號 15937 ，查詢到姓名 ' + name);
|
|
|
|
|
|
/* 刪除操作 */
|
|
|
// 在雜湊表中刪除鍵值對 (key, value)
|
|
|
map.delete(10583);
|
|
|
console.info('\n刪除 10583 後，雜湊表為\nKey -> Value');
|
|
|
map.print();
|
|
|
|
|
|
/* 走訪雜湊表 */
|
|
|
console.info('\n走訪鍵值對 Key->Value');
|
|
|
for (const pair of map.entries()) {
|
|
|
if (!pair) continue;
|
|
|
console.info(pair.key + ' -> ' + pair.val);
|
|
|
}
|
|
|
console.info('\n單獨走訪鍵 Key');
|
|
|
for (const key of map.keys()) {
|
|
|
console.info(key);
|
|
|
}
|
|
|
console.info('\n單獨走訪值 Value');
|
|
|
for (const val of map.values()) {
|
|
|
console.info(val);
|
|
|
}
|
