feat: add solutions to lc problems: No.2694,2695

* No.2694.Event Emitter
* No.2695.Array Wrapper

Author: yanglbme

solution/2600-2699/2694.Event Emitter/README.md

@@ -82,7 +82,46 @@ emitter.emit("firstEvent", [4, 5, 6]); // [], there are no subscriptio
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```ts
-
+type Callback = (...args: any[]) => any;
+type Subscription = {
+    unsubscribe: () => void;
+};
+
+class EventEmitter {
+    private d: Map<string, Set<Callback>> = new Map();
+
+    subscribe(eventName: string, callback: Callback): Subscription {
+        this.d.set(
+            eventName,
+            (this.d.get(eventName) || new Set()).add(callback),
+        );
+        return {
+            unsubscribe: () => {
+                this.d.get(eventName)?.delete(callback);
+            },
+        };
+    }
+
+    emit(eventName: string, args: any[] = []): any {
+        const callbacks = this.d.get(eventName);
+        if (!callbacks) {
+            return [];
+        }
+        return [...callbacks].map(callback => callback(...args));
+    }
+}
+
+/**
+ * const emitter = new EventEmitter();
+ *
+ * // Subscribe to the onClick event with onClickCallback
+ * function onClickCallback() { return 99 }
+ * const sub = emitter.subscribe('onClick', onClickCallback);
+ *
+ * emitter.emit('onClick'); // [99]
+ * sub.unsubscribe(); // undefined
+ * emitter.emit('onClick'); // []
+ */
 ```
 
 <!-- tabs:end -->

solution/2600-2699/2694.Event Emitter/README_EN.md

@@ -76,7 +76,46 @@ emitter.emit("firstEvent", [4, 5, 6]); // [], there are no subscriptio
 ### **TypeScript**
 
 ```ts
-
+type Callback = (...args: any[]) => any;
+type Subscription = {
+    unsubscribe: () => void;
+};
+
+class EventEmitter {
+    private d: Map<string, Set<Callback>> = new Map();
+
+    subscribe(eventName: string, callback: Callback): Subscription {
+        this.d.set(
+            eventName,
+            (this.d.get(eventName) || new Set()).add(callback),
+        );
+        return {
+            unsubscribe: () => {
+                this.d.get(eventName)?.delete(callback);
+            },
+        };
+    }
+
+    emit(eventName: string, args: any[] = []): any {
+        const callbacks = this.d.get(eventName);
+        if (!callbacks) {
+            return [];
+        }
+        return [...callbacks].map(callback => callback(...args));
+    }
+}
+
+/**
+ * const emitter = new EventEmitter();
+ *
+ * // Subscribe to the onClick event with onClickCallback
+ * function onClickCallback() { return 99 }
+ * const sub = emitter.subscribe('onClick', onClickCallback);
+ *
+ * emitter.emit('onClick'); // [99]
+ * sub.unsubscribe(); // undefined
+ * emitter.emit('onClick'); // []
+ */
 ```
 
 <!-- tabs:end -->

solution/2600-2699/2694.Event Emitter/Solution.ts

@@ -0,0 +1,40 @@
+type Callback = (...args: any[]) => any;
+type Subscription = {
+    unsubscribe: () => void;
+};
+
+class EventEmitter {
+    private d: Map<string, Set<Callback>> = new Map();
+
+    subscribe(eventName: string, callback: Callback): Subscription {
+        this.d.set(
+            eventName,
+            (this.d.get(eventName) || new Set()).add(callback),
+        );
+        return {
+            unsubscribe: () => {
+                this.d.get(eventName)?.delete(callback);
+            },
+        };
+    }
+
+    emit(eventName: string, args: any[] = []): any {
+        const callbacks = this.d.get(eventName);
+        if (!callbacks) {
+            return [];
+        }
+        return [...callbacks].map(callback => callback(...args));
+    }
+}
+
+/**
+ * const emitter = new EventEmitter();
+ *
+ * // Subscribe to the onClick event with onClickCallback
+ * function onClickCallback() { return 99 }
+ * const sub = emitter.subscribe('onClick', onClickCallback);
+ *
+ * emitter.emit('onClick'); // [99]
+ * sub.unsubscribe(); // undefined
+ * emitter.emit('onClick'); // []
+ */

solution/2600-2699/2695.Array Wrapper/README.md

@@ -66,7 +66,31 @@ obj1 + obj2; // 0
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```ts
-
+class ArrayWrapper {
+    private nums: number[];
+    private s: number;
+
+    constructor(nums: number[]) {
+        this.nums = nums;
+        this.s = nums.reduce((a, b) => a + b, 0);
+    }
+
+    valueOf() {
+        return this.s;
+    }
+
+    toString() {
+        return `[${this.nums.join(',')}]`;
+    }
+}
+
+/**
+ * const obj1 = new ArrayWrapper([1,2]);
+ * const obj2 = new ArrayWrapper([3,4]);
+ * obj1 + obj2; // 10
+ * String(obj1); // "[1,2]"
+ * String(obj2); // "[3,4]"
+ */
 ```
 
 <!-- tabs:end -->

solution/2600-2699/2695.Array Wrapper/README_EN.md

@@ -60,7 +60,31 @@ obj1 + obj2; // 0
 ### **TypeScript**
 
 ```ts
-
+class ArrayWrapper {
+    private nums: number[];
+    private s: number;
+
+    constructor(nums: number[]) {
+        this.nums = nums;
+        this.s = nums.reduce((a, b) => a + b, 0);
+    }
+
+    valueOf() {
+        return this.s;
+    }
+
+    toString() {
+        return `[${this.nums.join(',')}]`;
+    }
+}
+
+/**
+ * const obj1 = new ArrayWrapper([1,2]);
+ * const obj2 = new ArrayWrapper([3,4]);
+ * obj1 + obj2; // 10
+ * String(obj1); // "[1,2]"
+ * String(obj2); // "[3,4]"
+ */
 ```
 
 <!-- tabs:end -->

solution/2600-2699/2695.Array Wrapper/Solution.ts

@@ -0,0 +1,25 @@
+class ArrayWrapper {
+    private nums: number[];
+    private s: number;
+
+    constructor(nums: number[]) {
+        this.nums = nums;
+        this.s = nums.reduce((a, b) => a + b, 0);
+    }
+
+    valueOf() {
+        return this.s;
+    }
+
+    toString() {
+        return `[${this.nums.join(',')}]`;
+    }
+}
+
+/**
+ * const obj1 = new ArrayWrapper([1,2]);
+ * const obj2 = new ArrayWrapper([3,4]);
+ * obj1 + obj2; // 10
+ * String(obj1); // "[1,2]"
+ * String(obj2); // "[3,4]"
+ */