filter-declarative.ts

type Todo = {
  id: number;
  title: string;
  completed: boolean;
}

const todos: Todo[] = [
  { id: 1, title: 'Buy nachos', completed: false },
  { id: 2, title: 'Buy avocado', completed: true },
  { id: 3, title: 'Buy ground beef', completed: false },
];

const completedTodos = todos.filter((todo) => todo.completed);

console.log(completedTodos); // [{ id: 2, title: 'Buy avocado', completed: true }]