slice method

slice.rb

a = ["a", "b", "c"]
a.slice(1, 2)
# => ["b", "c"]

a = ["a", "b", "c"]
a.slice_before("b").to_a
# => [["a"], ["b", "c"]]

a = ["000", "b", "999"]
a.slice_before(/[a-z]/).to_a
# => [["000"], ["b", "999"]]

a = [100, 200, 300]
a.slice_before(150..250).to_a
# => [[100], [200, 300]]

a = [1, "200", 1.3]
a.slice_before(String).to_a
# => [[1], ["200", 1.3]]

a = [1, 2, 3, 4, 5]
a.slice_before do |item|
  item % 2 == 0
end
# => [[1], [2, 3], [4, 5]]

a = ["a", "b", "c"]
a.slice_after("b").to_a
# => [["a", "b"], ["c"]]

a = [1, 2, 3, 100, 101, 102]

# Create a new group when the difference 
# between two adjacent items is > 10.
a.slice_when do |x, y| 
  (y - x) > 10
end
# => [[1, 2, 3], [100, 101, 102]]

#  the slice methods don't return arrays. They return enumerables. 
# That means that you can use map, each and all your other favorite enumerable methods on.