code.log

console.log(typeof null);
VM92:1 object

console.log(1 + '1');
VM159:1 11

console.log(0.1 + 0.2 === 0.3);
VM275:1 false

function foo(){
    console.log(this);
}
foo();
VM391:2 Window {window: Window, self: Window, document: document, name: '', location: Location, …}

console.log(Math.max([2,4,6]));
VM494:1 NaN

const person = {
    name: 'John',
    age: 30
};
console.log(person.name);
VM663:5 John

const x = 10;

const x = 10;
function foo(){
    console.log(x);
    const x = 20;
}
foo();
VM855:3 Uncaught ReferenceError: Cannot access 'x' before initialization
    at foo (<anonymous>:3:17)
    at <anonymous>:6:1
foo @ VM855:3
(anonymous) @ VM855:6
console.log(2 + 3 * 4);
VM936:1 14

console.log('2' + 3 * 4);
VM945:1 212

console.log(typeof NaN);
VM1031:1 number

console.log(Array.isArray([]));
VM1130:1 true

console.log(1 === '1');
VM1202:1 false