Groovy: How to add a list as key and another list as values to a Map

Question

How can I add mylist as keys and myanotherlist as values to myMap

def mylist = [ John, Paul, Emily ]
def myanotherlist = [ 23, 45, 56 ]

def myMap = [:]
//
  println "myMap: ${myMap}"
  println "Age of Paul is: ${myMap['Paul']}"

Desired output:

  myMap: [
    John : 23 
    Paul : 45
    Emily : 56
   ]

 Age of Paul is: 45

You aren't asking for a list *as* a key; you want to get your keys *from* a list. — Scott Hunter, Jan 24 '20 at 16:27

score 4 · Answer 1 · answered Jan 24 '20 at 17:35

4

You can transpose the lists together (zip in other languages), then collect the entries

[mylist, myanotherlist].transpose().collectEntries()

answered Jan 24 '20 at 17:35

tim_yates

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score 2 · Accepted Answer · answered Jan 24 '20 at 16:31

2

You can use collectEntries on a list of indices (0 to mylist.size()):

def myMap = (0..<mylist.size()).collectEntries{[(mylist[it]) : myanotherlist[it]]}

answered Jan 24 '20 at 16:31

ernest_k

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Groovy: How to add a list as key and another list as values to a Map

2 Answers2