code :

```
julia> xs = [1,2,3];
julia> ys = [4,5,6];
julia> for (x, y) in zip(xs, ys)
@show x, y
end
(x, y) = (1, 4)
(x, y) = (2, 5)
(x, y) = (3, 6)
```

```
julia> for (x, y) in zip([1,2], [0,0,0])
@show x, y
end
(x, y) = (1, 0)
(x, y) = (2, 0)
```

```
julia> for (x, y, z) in zip([1,2], [3,4], [5,6])
@show x, y, z
end
(x, y, z) = (1, 3, 5)
(x, y, z) = (2, 4, 6)
```