Module Js_global

module Js_global: sig .. end
Contains functions available in the global scope (window in a browser context)

type intervalId 
identifies an interval started by Js_global.setInterval
type timeoutId 
identifies a timeout started by Js_global.setTimeout
val clearInterval : intervalId -> unit
clears an interval started by Js_global.setInterval
See also MDN
 
(* API for a somewhat aggressive snoozing alarm clock *)

let interval = Js.Undefined.empty

let remind () =
  Js.log "Wake Up!";
  IO.punchSleepyGuy ()

let snooze mins =
  interval := Js.Undefined.return @@ Js.Global.setInterval remind (mins * 60 * 1000)

let cancel () =
  Js.Undefined.iter Js.Global.clearInterval !interval
val clearTimeout : timeoutId -> unit
clears a timeout started by Js_global.setTimeout
See also MDN
 
(* A simple model of a code monkey's brain *)

let timer = Js.Undefined.empty

let work () =
  IO.closeHackerNewsTab ()

let procrastinate mins =
  Js.Undefined.iter fun Js.Global.clearTimeout !timer
  Js.Global.setTimeout work (mins * 60 * 1000)
val setInterval : (unit -> unit) -> int -> intervalId
repeatedly executes a callback with a specified interval (in milliseconds) between calls

returns an Js_global.intervalId that can be passed to Js_global.clearInterval to cancel the timeout

See also MDN
 
(* Will count up and print the count to the console every second *)

let count = ref 0

let tick () =
  count := !count + 1; Js.log (string_of_int !count)

let _ =
  Js.Global.setInterval tick 1000
val setTimeout : (unit -> unit) -> int -> timeoutId
executes a callback after a specified delay (in milliseconds)

returns a Js_global.timeoutId that can be passed to Js_global.clearTimeout to cancel the timeout

See also MDN
 
(* Prints "Timed out!" in the console after one second *)

let message = "Timed out!"

let _ =
  Js.Global.setTimeout (fun () -> Js.log message) 1000