Curried functions

[Yongxu Ren]

Sorry I actually didn’t mean to use this for currying
```
const add = a => b => a + b;
```
This was directly copied from Mark's example, I was thinking about making the non-nested arrow functional.
My idea is if you define
```
const add = (a,b) => a + b;
```
you will be able to use either ```add(a,b)``` or ```add(a)(b)```
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