Scope & Hoisting

What is the output?

console.log(x)
var x = 5

What does this output?

console.log(x)
let x = 5

What is logged?

function foo() {
  if (true) {
    var x = 10
    let y = 20
  }
  console.log(x)
  console.log(y)
}
foo()