Question

Given an array:

arr = [['a', '1'], ['b','2'], ['c', '3']] 

Whats the best way to split it into two arrays?

For example from the array above I want to get the following two arrays:

first = ['a','b','c']  
second = ['1', '2', '3'] 

Can i do this using collect?

Answer 1

ok i just stumbled upon arr.transpose

arr = [['a', '1'], ['b','2'], ['c', '3']].transpose 

first = arr[0] 

second = arr[1] 

compared to the answers above arr.zip, arr.map, and the foreach, which is more efficient?
Or which is the most elegant solution?

OR
(Thanks to comment by Jörg W Mittag – see comment below)
first, second = arr.transpose