Asynchronous Programming

• callback
  • global or context counters, collections and flags
  • utilities (async.js and analogues)
    • data flow (collection iteration utilities) f(collection, callback, done)
    • control flow: parallel/sequence(funcs, done)
  • Chain/do
  • EventEmitter
  • Collector
  • Promises
    • async/await
  • Observable
• generators/yield