JS Part 1

1. Integer, float, string, boolean
2. `Math.pow(2,2)`  `Math.sqrt(4);`
3. `Math.floor` and `Math.ceil`
4. `.search()` and `.indexOf()`
5. `.push()` and `.pop()`
6. Null means there is the value of nothing whereas undefined means that there isn't any current value assigned

JS Part 2

1. `x[0];`
2.
3.
4.
5.

```js
var array = "h,e,l,l,o, ,w,o,r,l,d".split(',');
var i = 1;

while (i < array.length) {
var t = array[i-1];
  array[i-1] = array[i];
  array[i] = t;
  i+=3;
}
```