CODEWITHSUNDEEP
listloopsgroovy
nshaw
nshaw

Reputation: 59

GROOVY Loop - generate List of Lists

This is what I am trying to do.

Inside a loop i am generating list items in the format [a,1]. First element is a string, second is a number. Once I have all the lists from the loop, I need to put this in another list. example -> [[a,1],[b,2],[c,3]]

This is my sample code I was trying albeit with just the int element. I am unfortunately not able to get what i am looking for. Should be something simple I am overlooking.

a = [1,2]
b = []
c = []
a.each
{
b.clear()
b.add(it)
println b
c.add(b)
}
println c

Output generated is

[1]
[2]
[[2], [2]]

I am trying to get

[1]
[2]
[[1], [2]]

EDIT

After help from Alexander

a = [1,2]
c = []
a.each
{
b = []
b.add(it)
c.add(b)
}
println c

Upvotes: 0

Views: 512

Answers (2)

nshaw
nshaw

Reputation: 59

Came across an easier way to achieve this. Using collate()

a = [1,2]
a.collate(1)

Result [[1],[2]]

Upvotes: 1

Alexandr Ivanov
Alexandr Ivanov

Reputation: 399

You insert into c a reference to the same list twice. Hence you get what you put.
Try to replace b.clear() with b = []
Then it will be a new list.

Upvotes: 0

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