• all values are promises
• all promises are dereferenced by calling a function on them
• eg, in the code below:
  • list is technically a promise of a list of strings
    • the strings were initially promises by they we’re dereferenced by the list operator, then by the let assignment
  • results is really a list promise of HttpResult promises
  • List.head returns a promise which waits for results to be resolved.
  • etc etc

let list : List<String> = ["https://...", ...]
let results : List<HttpResult> = List.map HttpClient.get list
(List.head results)!.body