# this code works
list = (0..20).to_a
# => [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
odd = list.select { |x| x.odd? }
# => [1,19]
list.reject! { |x| x.odd? }
# => [0,20]
# but can i emulate this type of functionality with an enumerable method?
set = [1,10]
# => [1,10]
one,five,ten = set
# => [1,10]
one
# => 1
five
# => 5
ten
# => 10
# ------------------------------------------------
# method I am looking for ?
list = (0..20).to_a
odd,even = list.select_with_reject { |x| x.odd? }
# put the matching items into the first variable
# and the non-matching into the second
解决方法
当然,你可以这样做：
odd,even = list.partition &:odd?