# Reading material for the ninth lecture:

```
In week nine we will discuss the following topics:
• (re)writing data structures (in JSON)
• Async VS Sync 
• Code flow (order of execution)
```

### Here are resources that we like you to read as a preparation for the coming lecture:

#### Async VS Sync 
- Read about Asynchronous vs. Synchronous programming: http://www.hongkiat.com/blog/synchronous-asynchronous-javascript/

#### Closures and async code
- [Why closures are helpful with async code](http://stackoverflow.com/questions/13343340/calling-an-asynchronous-function-within-a-for-loop-in-javascript)

_Please go through the material and come to class prepared!_