CODEWITHSUNDEEP
listgroovy
Abdennour TOUMI
Abdennour TOUMI

Reputation: 93173

groovy : split list into sub-lists equi-size

if i have : 

def all=[11,12,12,13,13,13,14,15,16,10]

i want to split this list into 3 sublists that has almost the same size . 

def result=[[11,12,12],[13,13,13],[14,15,16,10]]

i add a method to metaClass of List class : it is percent metod:

See : https://stackoverflow.com/a/20005844/747579

So i can do : 

def result=[all.percent(0,0.33),all.percent(0.34,0.66),all.percent(0.67,1)]

My question is : There is a method that splits a list into n sub-lists equisize , such as ; 

 def result=all.equisize(n) // n is the number of sublist wanted

Upvotes: 3

Views: 5814

Answers (1)

tim_yates
tim_yates

Reputation: 171084

You could try:

def result = all.collate( all.size().intdiv( 3 ) )

Which gives:

assert result == [ [ 11, 12, 12 ], [ 13, 13, 13 ], [ 14, 15, 16 ], [ 10 ] ]

If you don't want to keep the spare [10] at the end, you could pass false to the keepRemainder parameter of collate:

def result = all.collate( all.size().intdiv( 3 ), false )

Upvotes: 14

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