Question

I’m using the grails findAllBy() method to return a list of Position(s). Position has an integer field called location, which ranges from 1 to 15. I need to find the lowest location in the position list that is free.

For example, if there are positions at locations 1,2 and 4, then the algorithm should return 3. If locations 1 – 4 were filled, it would return 5.

Is there some simple groovy list/map functions to get the right number?

Thanks

Answer 1

If your list of positions were (limited to a mx of 5 for brevity):

def list = [ 1, 2, 4, 5 ]

And you know that you have a maximum of 5 of them, you can do:

(1..5).minus(list).min()

Which would give you 3