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tuples

main.ml
Tuple hold fixed numbers of items of different types. 
open Core

let () =
The items are separated by commas. Parenthesis are optional. 
  let five = (5, "five") in
  let _sad = 5, "five" in (* Poor style and should be avoided *)
  let (_, second) = five in (* Extract component *)
  printf "Hey OCaml, give me %s!\n" second;
The first and last elements of a pair can be extracted with fst and snd. 
  let first = five |> fst in (* Extract first component *)
  printf "I'll give you 3 + 2 = %d\n" first

console
Individual components are extracted by pattern matching syntax. 
$ dune exec ./main.exe
Hey OCaml, give me five!
I'll give you 3 + 2 = 5
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