notes on chapter 3 (promises)

[gvwilson]

• I love the way you show the way the code is supposed to be used before implementing it, I'm going to steal that
• the Pledge class is great, it helps clarify promises for me
• the note about .bind is great
• I also love "How are real promises different?"
• I didn't really understand why the character encoding example uses promises (instead of doing a synchronous read). This is a confusion I have in general with Node though -- I often see code that uses promises for reasons that are unclear to me.
• re "What is the difference between setImmediate and process.nextTick? When would you use each one?" in the exercises -- it wasn't clear to me how I was supposed to figure out the answer to this question. I Googled it and found a pretty good blog post.