reduce

Question

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

There was a mistake in this problem and Thanks to pinglu85 for pointing it out. It is fixed now.

Snippet

[1,2,3].reduce((a,b) => {
  console.log(a,b)
});

[1,2,3].reduce((a,b) => {
  console.log(a,b)
}, 0)

Source

Source From