Really good understanding of the rendering

[jackbridger]

Your code is very clear and logical and reading it has helped me understand the concepts especially how you update the state using rendering. Thank you!

For instance the below:

todoNode.addEventListener("click", function(e) { var newState = todoFunctions.markTodo(state, todo.id); update(newState); });
You only update the state inside the event listener.

Then you have things like the below outside, which get updated on the DOM when you update state.

if (todo.done) { markTodoButtonNode.textContent = "✔"; todoSpan.style.textDecoration = "line-through"; }
Great job!