Javascript keypress handler

keypress.js

 const commands = {
	'ctrl+z' => History.undo,
	'ctrl+y' => History.redo,
	'escape': () => { alert('esc'); }
};

$(window).on('keydown', event => {
	let label = '';
	if (event.ctrlKey) { label += 'ctrl+'; }
	if (event.altKey) { label += 'alt+'; }
	if (event.shiftKey) { label += 'shift+'; }
	label += event.key.toLowerCase();
	console.log(label);
	commands[label]?.();
});