Add more methods to the array helper

packages/core/lib/utils/array.ts

@@ -145,4 +145,48 @@ export class Arr {
 
     return undefined;
   }
+
+  static exists<T = any>(arr: T[], key: string | number): boolean {
+    if (typeof key === 'number' && key >= 0 && key < arr.length) {
+      return true;
+    }
+
+    if (typeof key === 'string') {
+      const splitKeys = key.split('.');
+      if (!splitKeys.length) return false;
+
+      if (Arr.isArray(arr[splitKeys[0]])) {
+        return Arr.exists(arr[splitKeys[0]], splitKeys.slice(1).join('.'));
+      }
+
+      if (Obj.isObj(arr[splitKeys[0]])) {
+        return (
+          Obj.get(arr[splitKeys[0]], splitKeys.slice(1).join('.')) !== undefined
+        );
+      }
+    }
+
+    return false;
+  }
+
+  static last<T = any>(
+    arr: T[],
+    predicate?: ((item: T, index: number, array: T[]) => boolean) | null,
+  ): T | undefined {
+    if (!arr || arr.length === 0) {
+      return undefined;
+    }
+
+    if (!predicate) {
+      return arr[arr.length - 1];
+    }
+
+    for (let i = arr.length - 1; i >= 0; i--) {
+      if (predicate(arr[i], i, arr)) {
+        return arr[i];
+      }
+    }
+
+    return undefined;
+  }
 }

packages/core/tests/helpers/arrayHelper.spec.ts

@@ -0,0 +1,36 @@
+import { Arr } from '../../lib/utils/array';
+
+describe('Array Helper', () => {
+  beforeEach(async () => {});
+
+  it('check key exists', () => {
+    const arr = [1, 2, 3, 4, 5];
+    expect(Arr.exists(arr, 2)).toBeTruthy();
+  });
+
+  it('check key does not exist', () => {
+    const arr = [1, 2, 3, 4, 5];
+    expect(Arr.exists(arr, 6)).toBeFalsy();
+  });
+
+  it('should return last element matching predicate', () => {
+    const arr = [1, 2, 3, 4, 5];
+    expect(Arr.last(arr, x => x < 4)).toBe(3);
+    expect(Arr.last(arr)).toBe(5);
+  });
+
+  it('should return the last object that matches the predicate', () => {
+    const users = [
+      { name: 'Alice', age: 25 },
+      { name: 'Bob', age: 30 },
+      { name: 'Charlie', age: 35 },
+      { name: 'David', age: 30 },
+    ];
+    const lastUserUnder35 = Arr.last(users, user => user.age < 35);
+    expect(lastUserUnder35).toEqual({ name: 'David', age: 30 });
+  });
+
+  it('should return undefined for empty array', () => {
+    expect(Arr.last([])).toBeUndefined();
+  });
+});