foreach like pattern

[mipmip]

Say I have a array of strings with usernames. Can I iterate over this array creating a new array with records?

in array:

["jane" "pete" "richie"]

results:

[
  {
    username = "jane",
    email = "jane@nickel.org"
  },
  {
    username = "pete",
    email = "pete@nickel.org"
  },
  {
    username = "richie",
    email = "richie@nickel.org"
  },
]

[vkleen]

This is a textbook application for std.array.map:

["jane", "pete", "richie"]
|> std.array.map
  (
    fun name =>
      {
        username = name,
        email = "%{name}@nickel.org"
      }
  )

In general, a foreach like pattern where the elements are handled independently from each other calls for std.array.map. If you need to manipulate some state depending on each element to arrive at a final value, you'd typically want to look into std.array.fold_left.