Do You Know JS?

null == 0

let a = 1
{
    setTimeout(() => a = 2, 0)
    console.log(a)
    let a = 3
}

9999999999999999 % 100

typeof Number('one') === typeof 1

let x = 0
async function test() {
  x += await 2
  console.log(x)
}
test()
x += 1
console.log(x)

with (Math) {
1/-0*!0 === 9e9*+max()??NaN
}

[123] == [123]

JSON.stringify("js") == "js";

parseInt(0.00000032) +
parseInt(0.99999999)

<html>
  <head>
    <script>
    var name = null;
    console.log(typeof name);
    </script>
  </head>
</html>

Number.prototype.isOne =
function() {
  return this === 1
};
(1).isOne()

3.7 + 1,3

typeof null

[] == ![]

('3' - 1) + ('3' + 1)

Number.prototype.two = () => 2
;[1..two].map(three => three())

0.1 + 0.2 === 0.3

[,,].toString()

"b" + "a" + +"a" + "a"