<header>
  <h2 class="title">DOMTokenList: forEach() method</h2>
  <p class="description">Виконує передану функцію один раз для кожного елемента DOMTokenList.</p>
</header>
<main>
  <div class="result">
    <ul id="taskList"></ul>
    <div>
      <input type="text" id="taskInput" placeholder="Введіть нове завдання">
      <button id="addTaskBtn">Додати завдання</button>
    </div>
    <div>
      <button id="toggleCompletedBtn">Переключити завершені</button>
    </div>
  </div>
</main>
body {
  font-size: 16px;
  line-height: 1.5;
  font-family: monospace;
}

header {
  background-color: #f1f1f1;
  margin-bottom: 25px;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

header h2.title {
  padding-bottom: 15px;
  border-bottom: 1px solid #999;
}

header p.description {
  font-style: italic;
  color: #222;
}

.result {
  background-color: #f8f8f8;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

.completed {
  text-decoration: line-through;
  color: #999;
}
const taskList = document.getElementById('taskList');
const taskInput = document.getElementById('taskInput');
const addTaskBtn = document.getElementById('addTaskBtn');
const toggleCompletedBtn = document.getElementById('toggleCompletedBtn');

let tasks = [];

function renderTasks() {
  taskList.innerHTML = '';
  tasks.forEach((task, index) => {
    const li = document.createElement('li');
    li.textContent = task.text;
    if (task.completed) {
      li.classList.add('completed');
    }
    li.addEventListener('click', () => {
      tasks[index].completed = !tasks[index].completed;
      renderTasks();
    });
    taskList.appendChild(li);
  });
}

addTaskBtn.addEventListener('click', () => {
  const taskText = taskInput.value.trim();
  if (taskText) {
    tasks.push({ text: taskText, completed: false });
    taskInput.value = '';
    renderTasks();
  }
});

toggleCompletedBtn.addEventListener('click', () => {
  tasks.forEach(task => {
    task.completed = !task.completed;
  });
  renderTasks();
});

renderTasks();

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