Chapter 9. Promises and Proxies
This chapter introduces the important concept of asynchronous programming and how JavaScript is an ideal language to utilize it. The other topic that we will cover in this chapter is meta programming with proxies. These two concepts are introduced in ES6.
In this chapter, our primary focus is to understand asynchronous programming, before we jump into the language - specific constructs, let's spend time in understanding the concept first.
The first model-the synchronous model-is where it all began. This is the simplest model of programming. Each task is executed one at a time, and only after the first task completes execution can, the next task start. When you program in this model, we expect that all tasks before the current task are complete and there is no error. Take a look at the following figure:
The single threaded asynchronous model is a familiar model we all know. However, this model can be wasteful and optimized. For any nontrivial programs composed...
