Каков (единственный) лучший источник онлайн для изучения OpenOffice.org, пишущего сценарий [закрытого] API

var todos = [{
  text: 'Order airline tickets',
  completed: false
},{
  text: 'Vaccine appointment',
  completed: true
}, {
  text: 'Order Visa',
  completed: true
}, {
  text: 'Book hotell',
  completed: false
}, {
  text: 'Book taxi to airport',
  completed: true
}];
	
showTodos(todos);

function addTodo(add_todo) {
  var p = document.createElement('p')
  p.textContent = add_todo.text
  document.querySelector('body').appendChild(p)
  var checkBox = document.createElement("input")
  var label = document.createElement("label")
  checkBox.type = "checkbox"
  checkBox.value = addTodo.completed
  document.querySelector('body').appendChild(checkBox)
  document.querySelector('body').appendChild(label)
  label.appendChild(document.createTextNode(add_todo.completed))
}

function showTodos(show_todos) {
  //function to show the whole object
  show_todos.forEach(function (todo) {
  addTodo(todo);  
  }) 
}

function validate() {
  let isChecked = false;
  if ( document.getElementById( 'filterTodo' ).checked ) {
    isChecked = true;
    console.log(isChecked);
  } else {
    isChecked = false;
    console.log(isChecked);
  }
}

	<label style="font: bold 1.5em courier !important">
		<input type="checkbox" id="filterTodo" onchange="validate()">Hide completed
	</label>