Updated code formats and removed useless codes

codes/typescript/chapter_hashing/array_hash_map.ts

@@ -8,81 +8,21 @@
 class Entry {
     public key: number;
     public val: string;
+
     constructor(key: number, val: string) {
         this.key = key;
         this.val = val;
     }
 }
 
-/* 数组的初始化和基本操作 */
-class ArrayList {
-
-  private readonly elements: Entry[];
-  constructor(length: number) {
-    this.elements = new Array(length);
-    this.initialize();
-  }
-
-  /* 初始化 */
-  private initialize() {
-    this.elements.fill(null as any, 0, this.elements.length - 1);
-  }
-
-  /* 新增和删除 */
-  public set(key: number, val: string | null) {
-    if (val !== null) {
-      this.elements[key] = new Entry(key, val);
-    } else {
-      this.elements[key] = null as any;
-    }
-  }
-
-  /* 获取 */
-  public get(key: number): string | null {
-    if (this.elements[key] instanceof Entry) {
-      return this.elements[key].val;
-    }
-    return null;
-  }
-
-  public entrySet() {
-    let arr = [];
-    for (let i = 0; i < this.elements.length; i++) {
-      if (this.elements[i]) {
-        arr.push(this.elements[i]);
-      }
-    }
-    return arr;
-  }
-
-  public valueSet() {
-    let arr = [];
-    for (let i = 0; i < this.elements.length; i++) {
-      if (this.elements[i]) {
-        arr.push(this.elements[i].val);
-      }
-    }
-    return arr;
-  }
-
-  public keySet() {
-    let arr = [];
-    for (let i = 0; i < this.elements.length; i++) {
-      if (this.elements[i]) {
-        arr.push(this.elements[i].key);
-      }
-    }
-    return arr;
-  }
-}
-
 /* 基于数组简易实现的哈希表 */
 class ArrayHashMap {
-  // 初始化一个长度为 100 的桶（数组）
+
-  private bucket: ArrayList;
+    private readonly bucket: Entry[];
 
     constructor() {
-    this.bucket = new ArrayList(100);
+        // 初始化一个长度为 100 的桶（数组）
+        this.bucket = (new Array(100)).fill(null as any);
     }
 
     /* 哈希函数 */
@@ -93,37 +33,55 @@ class ArrayHashMap {
     /* 查询操作 */
     public get(key: number): string | null {
         let index = this.hashFunc(key);
-    let val = this.bucket.get(index);
+        let entry = this.bucket[index];
-    if (val === null) return null;
+        if (entry === null) return null;
-    return val;
+        return entry.val;
     }
 
     /* 添加操作 */
     public put(key: number, val: string) {
         let index = this.hashFunc(key);
-    this.bucket.set(index, val);
+        this.bucket[index] = new Entry(index, val);
     }
 
     /* 删除操作 */
     public remove(key: number) {
         let index = this.hashFunc(key);
         // 置为 null ，代表删除
-    this.bucket.set(index, null);
+        this.bucket[index] = null as any;
     }
 
     /* 获取所有键值对 */
     public entrySet(): Entry[] {
-    return this.bucket.entrySet();
+        let arr = [];
+        for (let i = 0; i < this.bucket.length; i++) {
+            if (this.bucket[i]) {
+                arr.push(this.bucket[i]);
+            }
+        }
+        return arr;
     }
 
     /* 获取所有键 */
     public keySet(): number[] {
-    return this.bucket.keySet();
+        let arr = [];
+        for (let i = 0; i < this.bucket.length; i++) {
+            if (this.bucket[i]) {
+                arr.push(this.bucket[i].key);
+            }
+        }
+        return arr;
     }
 
     /* 获取所有值 */
     public valueSet(): string[] {
-    return this.bucket.valueSet();
+        let arr = [];
+        for (let i = 0; i < this.bucket.length; i++) {
+            if (this.bucket[i]) {
+                arr.push(this.bucket[i].val);
+            }
+        }
+        return arr;
     }
 
     /* 打印哈希表 */
@@ -136,4 +94,42 @@ class ArrayHashMap {
     }
 }
 
-export default ArrayHashMap;
+
+/* 初始化哈希表 */
+const map = new ArrayHashMap();
+/* 添加操作 */
+// 在哈希表中添加键值对 (key, value)
+map.put(12836, '小哈');
+map.put(15937, '小啰');
+map.put(16750, '小算');
+map.put(13276, '小法');
+map.put(10583, '小鸭');
+console.info('\n添加完成后，哈希表为\nKey -> Value');
+map.print();
+
+/* 查询操作 */
+// 向哈希表输入键 key ，得到值 value
+let name = map.get(15937);
+console.info('\n输入学号 15937 ，查询到姓名 ' + name);
+
+/* 删除操作 */
+// 在哈希表中删除键值对 (key, value)
+map.remove(10583);
+console.info('\n删除 10583 后，哈希表为\nKey -> Value');
+map.print();
+
+/* 遍历哈希表 */
+console.info('\n遍历键值对 Key->Value');
+for (const entry of map.entrySet()) {
+    console.info(entry.key + ' -> ' + entry.val);
+}
+console.info('\n单独遍历键 Key');
+for (const key of map.keySet()) {
+    console.info(key);
+}
+console.info('\n单独遍历值 Value');
+for (const val of map.valueSet()) {
+    console.info(val);
+}
+
+export {};

codes/typescript/chapter_hashing/hash_map.ts

@@ -1,51 +0,0 @@
-/*
- * File: hash_map.ts
- * Created Time: 2022-12-20
- * Author: Daniel (better.sunjian@gmail.com)
- */
-
-import ArrayHashMap from './array_hash_map';
-
-class HashMap {
-
-  constructor() {
-    /* 初始化哈希表 */
-    const map = new ArrayHashMap();
-    /* 添加操作 */
-    // 在哈希表中添加键值对 (key, value)
-    map.put(12836, '小哈');
-    map.put(15937, '小啰');
-    map.put(16750, '小算');
-    map.put(13276, '小法');
-    map.put(10583, '小鸭');
-    console.info('\n添加完成后，哈希表为\nKey -> Value');
-    map.print();
-
-    /* 查询操作 */
-    // 向哈希表输入键 key ，得到值 value
-    let name = map.get(15937);
-    console.info('\n输入学号 15937 ，查询到姓名 ' + name);
-
-    /* 删除操作 */
-    // 在哈希表中删除键值对 (key, value)
-    map.remove(10583);
-    console.info('\n删除 10583 后，哈希表为\nKey -> Value');
-    map.print();
-
-    /* 遍历哈希表 */
-    console.info('\n遍历键值对 Key->Value');
-    for (const entry of map.entrySet()) {
-      console.info(entry.key + ' -> ' + entry.val);
-    }
-    console.info('\n单独遍历键 Key');
-    for (const key of map.keySet()) {
-      console.info(key);
-    }
-    console.info('\n单独遍历值 Value');
-    for (const val of map.valueSet()) {
-      console.info(val);
-    }
-  }
-}
-
-export default HashMap;

codes/typescript/tsconfig.json

@@ -1,15 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "es6",
-    "moduleResolution": "node",
-    "resolveJsonModule": true,
-    "module": "commonjs",
-    "strict": true,
-    "noEmit": false,
-    "sourceMap": true,
-    "baseUrl": ".",
-    "esModuleInterop": true,
-    "downlevelIteration": true,
-  },
-  "include": ["./**/*"],
-}

docs/chapter_hashing/hash_map.md

@@ -512,83 +512,24 @@ $$
     ```typescript title="array_hash_map.ts"
     /* 键值对 Number -> String */
     class Entry {
+
         public key: number;
         public val: string;
+
         constructor(key: number, val: string) {
             this.key = key;
             this.val = val;
         }
     }
 
-    /* 数组的初始化和基本操作 */
-    class ArrayList {
-    
-        private readonly elements: Entry[];
-        constructor(length: number) {
-            this.elements = new Array(length);
-            this.initialize();
-        }
-    
-        /* 初始化 */
-        private initialize() {
-            this.elements.fill(null as any, 0, this.elements.length - 1);
-        }
-        
-        /* 新增和删除 */
-        public set(key: number, val: string | null) {
-            if (val !== null) {
-                this.elements[key] = new Entry(key, val);
-            } else {
-                this.elements[key] = null as any;
-            }
-        }
-        
-        /* 获取 */
-        public get(key: number): string | null {
-            if (this.elements[key] instanceof Entry) {
-                return this.elements[key].val;
-            }
-            return null;
-        }
-        
-        public entrySet() {
-        let arr = [];
-            for (let i = 0; i < this.elements.length; i++) {
-                if (this.elements[i]) {
-                    arr.push(this.elements[i]);
-                }
-            }
-            return arr;
-        }
-        
-        public valueSet() {
-            let arr = [];
-            for (let i = 0; i < this.elements.length; i++) {
-                if (this.elements[i]) {
-                    arr.push(this.elements[i].val);
-                }
-            }
-            return arr;
-        }
-        
-        public keySet() {
-            let arr = [];
-            for (let i = 0; i < this.elements.length; i++) {
-                if (this.elements[i]) {
-                    arr.push(this.elements[i].key);
-                }
-            }
-            return arr;
-        }
-    }
-
     /* 基于数组简易实现的哈希表 */
     class ArrayHashMap {
-        // 初始化一个长度为 100 的桶（数组）
+
-        private bucket: ArrayList;
+        private readonly bucket: Entry[];
 
         constructor() {
-            this.bucket = new ArrayList(100);
+            // 初始化一个长度为 100 的桶（数组）
+            this.bucket = (new Array(100)).fill(null as any);
         }
     
         /* 哈希函数 */
@@ -599,37 +540,55 @@ $$
         /* 查询操作 */
         public get(key: number): string | null {
             let index = this.hashFunc(key);
-            let val = this.bucket.get(index);
+            let entry = this.bucket[index];
-            if (val === null) return null;
+            if (entry === null) return null;
-            return val;
+            return entry.val;
         }
     
         /* 添加操作 */
         public put(key: number, val: string) {
             let index = this.hashFunc(key);
-            this.bucket.set(index, val);
+            this.bucket[index] = new Entry(index, val);
         }
     
         /* 删除操作 */
         public remove(key: number) {
             let index = this.hashFunc(key);
             // 置为 null ，代表删除
-            this.bucket.set(index, null);
+            this.bucket[index] = null as any;
         }
     
         /* 获取所有键值对 */
         public entrySet(): Entry[] {
-            return this.bucket.entrySet();
+            let arr = [];
+            for (let i = 0; i < this.bucket.length; i++) {
+                if (this.bucket[i]) {
+                    arr.push(this.bucket[i]);
+                }
+            }
+            return arr;
         }
     
         /* 获取所有键 */
         public keySet(): number[] {
-            return this.bucket.keySet();
+            let arr = [];
+            for (let i = 0; i < this.bucket.length; i++) {
+                if (this.bucket[i]) {
+                    arr.push(this.bucket[i].key);
+                }
+            }
+            return arr;
         }
     
         /* 获取所有值 */
         public valueSet(): string[] {
-            return this.bucket.valueSet();
+            let arr = [];
+            for (let i = 0; i < this.bucket.length; i++) {
+                if (this.bucket[i]) {
+                    arr.push(this.bucket[i].val);
+                }
+            }
+            return arr;
         }
     }
     ```