This is a solution for the specific type of vector supplied in the challenge description

## Summary

```
function crossProduct(a, b) {
if(arguments.length == 0) return null
let cx = a[1]*b[2] - a[2]*b[1]
let cy = a[2]*b[0] - a[0]*b[2]
let cz = a[0]*b[1] - a[1]*b[0]
return [cx, cy, cz]
}
```

**Challenge:** Vector cross product

**Link to the challenge:**