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ASYNC JAVASCRIPT
best practices




                 Rajasekharan Vengalil
                   bit.ly/avranju | @avranju
                        Developer Evangelist
                                   Microsoft
Agenda
• Why async?
• Problems with async development today
• Promises
  • Building a “promise” framework
    • Demo
  • Support for promises in jQuery
• An introduction to RxJS
  • What is RxJS?
  • The Basics
  • Demo – RxJS in action
WHY IS THIS IMPORTANT?
Why async?
• No more free lunch!
• Fast, fluid interfaces make for compelling UX
• Most HTML5 APIs expose async interfaces
• Leverage multiple core CPUs
• Delegate I/O and CPU intensive tasks to
 background processes
Problems with async development today
• Tends to turn control flow “inside-out”
 • Don’t call me, I’ll call you
• Managing state can get tricky even with
  closures
• Handling errors correctly very hard to do
• Code easily gets lost in nested callback
  madness
JAVASCRIPT “PROMISES”
Building a mini async JS framework
AN INTRODUCTION TO
RXJS
A composable events framework
What is RxJS?
• RxJS is a framework that takes the idea of
  “promises” to the next level
• Stands for “Reactive Extensions for JavaScript”
 • Available for .NET and C# as well
• Ships with support for jQuery, Dojo, Ext etc.
• Provides an elegant mechanism for composing
  operations on observable sequences
• Includes a suite of “combinator” routines that
  cater to a wide range of scenarios
RxJS – The Basics
• Event sources are abstracted as “Observables” – things
  that can be observed
• Event consumers are “Observers” – things that want to be
  notified of stuff


            Observable   Subscribes          Observer

        Event             Notifies    Your
        Source                        Code
RXJS IN ACTION
Let’s look at some code
Some Resources
• IE blog post on JavaScript      • Shameless plug
  “Promises” - bit.ly/q7Q9EP
                                   • My blog – bit.ly/avranju
• jQuery documentation on
                                   • Twitter – @avranju
  “Deferred” objects -
  bit.ly/nOhvPl                    • Email – rajave@microsoft.com
• Erik Meijer’s talk on RxJS -
  bit.ly/pENZ4I
• Matthew Podwysocki’s
  excellent blog post series on
  RxJS - bit.ly/o4ZoaG

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Async JavaScript

  • 1. ASYNC JAVASCRIPT best practices Rajasekharan Vengalil bit.ly/avranju | @avranju Developer Evangelist Microsoft
  • 2. Agenda • Why async? • Problems with async development today • Promises • Building a “promise” framework • Demo • Support for promises in jQuery • An introduction to RxJS • What is RxJS? • The Basics • Demo – RxJS in action
  • 3. WHY IS THIS IMPORTANT?
  • 4. Why async? • No more free lunch! • Fast, fluid interfaces make for compelling UX • Most HTML5 APIs expose async interfaces • Leverage multiple core CPUs • Delegate I/O and CPU intensive tasks to background processes
  • 5. Problems with async development today • Tends to turn control flow “inside-out” • Don’t call me, I’ll call you • Managing state can get tricky even with closures • Handling errors correctly very hard to do • Code easily gets lost in nested callback madness
  • 6. JAVASCRIPT “PROMISES” Building a mini async JS framework
  • 7. AN INTRODUCTION TO RXJS A composable events framework
  • 8. What is RxJS? • RxJS is a framework that takes the idea of “promises” to the next level • Stands for “Reactive Extensions for JavaScript” • Available for .NET and C# as well • Ships with support for jQuery, Dojo, Ext etc. • Provides an elegant mechanism for composing operations on observable sequences • Includes a suite of “combinator” routines that cater to a wide range of scenarios
  • 9. RxJS – The Basics • Event sources are abstracted as “Observables” – things that can be observed • Event consumers are “Observers” – things that want to be notified of stuff Observable Subscribes Observer Event Notifies Your Source Code
  • 10. RXJS IN ACTION Let’s look at some code
  • 11. Some Resources • IE blog post on JavaScript • Shameless plug “Promises” - bit.ly/q7Q9EP • My blog – bit.ly/avranju • jQuery documentation on • Twitter – @avranju “Deferred” objects - bit.ly/nOhvPl • Email – rajave@microsoft.com • Erik Meijer’s talk on RxJS - bit.ly/pENZ4I • Matthew Podwysocki’s excellent blog post series on RxJS - bit.ly/o4ZoaG