Edit in JSFiddle

document.writeln(typeof undefined + '</br>');
document.writeln(typeof true + '</br>');
document.writeln(typeof "42" + '</br>');
document.writeln(typeof 42 + '</br>');
document.writeln(typeof { life: 42 } + '</br>');
document.writeln(typeof Symbol() + '</br>');
document.writeln(typeof [] + '</br>');
document.writeln(typeof null + '</br>');
document.writeln(typeof function a () {} + '</br>');