[GROOVY-692] minv/maxv where closure computes value

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0-beta-8
• Fix Version/s: 1.0-beta-10
• Assignee: Guillaume Sauthier
• Reporter: Martin C. Martin
• Created: 06/Jan/05 12:12
• Updated: 02/Feb/05 23:24
• Resolved: 02/Feb/05 23:24

Description

It would be great to have an alternate form of min()/max() where closure returns a value to be compared, rather than a comparison. I'm often trying to choose the "most desirable" element of a list, and I have some expression that computes the desirability. Right now I have to do:

mylist.max

{x,y | my_desirability_expression(x) <=> my_desirability_expression(y) }

That's wordy because I need to write the desirability expression twice, and I also need to have explicit arguments for the closure. It would be great if there were a "maxv" where I could write:

mylist.maxv

{ my_desirability_expression(it) }

maxv for "maximum of value." Similarly with minv.

This is trivial to implement; here's what I use (a global function):

def minv (l, Closure f) {
return l.min

{ x, y | f(x) <=> f(y) }

}