Let's say I have the following array:

```
arr = [[5, 1], [2, 7]]

```

and I want to find the minimum element, comparing the second element of the elements. The minimum element will be `[5, 1]` since `1` is less than `7`. I can use the following code:

```
arr.min {|a,b| a[1] <=> b[1]}

```

For calculating the maximum, I can do the same:

```
arr.max {|a,b| a[1] <=> b[1]}

```

That gives `[2, 7]`.

I use the same block all the time. I would like to have that block somewhere and provide it to the min/max function. I hoped something like:

```
blo = lambda {|a,b| a[1] <=> b[1]}
arr.min blo

```

would work, but it didn't. Any idea on how I can do this?