Hi, when I access an array with arr[0]
sometimes it returns the element, and sometimes it returns a type option
on the element, and I have to call Option.getExn()
, why?
Hi @fccm I think you might have opened Belt
module WithBelt = {
open Belt
let a = [1, 2, 3]
//type of b is option<int>
let b = a[0]
}
module WithoutBelt = {
let a = [1, 2, 3]
//type of b is int
let b = a[0]
}
2 Likes
Indeed, I didn’t notice this trick
Thanks!