Hoisting V

Question

What does the code snippet to the right output by console.log?

Snippet

(() => {
  if (!fn) {
    function fn() {
      console.log('2')
    }
  }
  fn()
})()

function fn() {
  console.log('1')
}

// another one
function fn1() {
  console.log('3')
}

(() => {
  if (!fn1) {
    function fn1() {
      console.log('4')
    }
  }
  fn1()
})()


// another one !
(() => {
  if (false) {
    function fn3() {
      console.log('5')
    }
  }
  fn3()
})()

Source

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