Groovy custom sort a map by value

问题

I have a map such as

m=[
     "james":"silly boy",
     "janny":"Crazy girl",
     "jimmy":"funny man",
     "georges":"massive fella"
];

I want to sort this map by its value but ignoring the case (this is really why the custom sort is needed). Hence I figured I had to implement a custom sort using a closure. But I'm brand new at Groovy and been struggling to get this very simple task done!

The desired results would be:

["janny":"Crazy girl", "jimmy":"funny man", "georges":"massive fella", "james":"silly boy"]

Thanks !

回答1:

To sort with case insensitive, use

m.sort { it.value.toLowerCase() }

回答2:

Assuming you mean you want to sort on value, you can just do:

Map m =[ james  :"silly boy",
         janny  :"Crazy girl",
         jimmy  :"funny man",
         georges:"massive fella" ]

Map sorted = m.sort { a, b -> a.value <=> b.value }

回答3:

BTW, here is code which is showing different sorting with and without toLowerCase():

Map m =[ james  :"silly boy",
         janny  :"crazy girl",
         jimmy  :"Funny man",
         georges:"massive fella" ]
Map sorted = m.sort { a, b -> a.value <=> b.value }
println sorted
sorted = m.sort { a, b -> a.value.toLowerCase() <=> b.value.toLowerCase() }
println sorted

And wll print:

[jimmy:Funny man, janny:crazy girl, georges:massive fella, james:silly boy]
[janny:crazy girl, jimmy:Funny man, georges:massive fella, james:silly boy]

回答4:

If somebody is looking for how to make in work in the Jenkins pipeline script, you will have to create a separate method with @NonCPS annotation for that:

@NonCPS
def getSorted(def mapSizeMap){
    mapSizeMap.sort(){ a, b -> b.value <=> a.value }
}

And then call it from the pipeline script.

def sortedMapZoneMap = getSorted(mapZonesMap)

You can of course apply "case sensitive" logic on top.

来源：https://stackoverflow.com/questions/13686659/groovy-custom-sort-a-map-by-value

标签

sorting

groovy

map