Delete from Array and return deleted elements in Ruby -

how can delete elements array , select them?

for example:

class foo    def initialize     @a = [1,2,3,4,5,6,7,8,9]   end    def get_a     return @a   end end  foo = foo.new b = foo.get_a.sth{ |e| e < 4 } p b # => [1,2,3] p foo.get_a # => [4,5,6,7,8,9,10] 

what can use instead of foo.get_a.sth?

if don't need retain object id of a:

a = [1,2,3,4,5,6,7,8,9,10] b, = a.partition{|e| e < 4} b # => [1, 2, 3] # => [4, 5, 6, 7, 8, 9, 10] 

if need retain object id of a, use temporal array c:

a = [1,2,3,4,5,6,7,8,9,10] b, c = a.partition{|e| e < 4} a.replace(c)