File: async.coffee

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coffeescript 2.7.0-4
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# Your browser must support async/await and speech synthesis
# to run this example.

sleep = (ms) ->
  new Promise (resolve) ->
    window.setTimeout resolve, ms

say = (text) ->
  window.speechSynthesis.cancel()
  window.speechSynthesis.speak new SpeechSynthesisUtterance text

countdown = (seconds) ->
  for i in [seconds..1]
    say i
    await sleep 1000 # wait one second
  say "Blastoff!"

countdown 3