Promise.all()

Question

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

Snippet

(async () => {
  await Promise.all([]).then((value) => {
    console.log(value)
  }, (error) => {
    console.log(error)
  })
  
  await Promise.all([1,2,Promise.resolve(3), Promise.resolve(4)]).then((value) => {
    console.log(value)
  }, (error) => {
    console.log(error)
  })
  
  await Promise.all([1,2,Promise.resolve(3), Promise.reject('error')]).then((value) => {
    console.log(value)
  }, (error) => {
    console.log(error)
  })
})()

Source

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