Promise then callbacks II

Question

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

Snippet

Promise.resolve(1)
.then((val) => {
  console.log(val)
  return val + 1
}).then((val) => {
  console.log(val)
}).then((val) => {
  console.log(val)
  return Promise.resolve(3)
    .then((val) => {
      console.log(val)
    })
}).then((val) => {
  console.log(val)
  return Promise.reject(4)
}).catch((val) => {
  console.log(val)
}).finally((val) => {
  console.log(val)
  return 10
}).then((val) => {
  console.log(val)
})

Source

Source From