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A Utilitary package functionalities modules for improve a secure performatic development.
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lib/krug/util/array.util.ex
defmodule Krug.ArrayUtil do
@moduledoc """
Utilitary module to handle array transformations.
"""
@doc """
Rotates an ```array``` X ```positions``` in direction from left to right.
A initial array [1,2,3,4] turn in [2,3,4,1] if rotate ```positions``` equal
to 1.
## Examples
```elixir
iex > Krug.ArrayUtil.rotate_right(nil,1)
nil
```
```elixir
iex > Krug.ArrayUtil.rotate_right([],1)
[]
```
```elixir
iex > Krug.ArrayUtil.rotate_right([1],2)
[1]
```
```elixir
iex > Krug.ArrayUtil.rotate_right([1,2,3,4],nil)
[1,2,3,4]
```
```elixir
iex > Krug.ArrayUtil.rotate_right([1,2,3,4],1)
[2,3,4,1]
```
```elixir
iex > Krug.ArrayUtil.rotate_right([1,2,3,4],3)
[4,1,2,3]
```
"""
@doc since: "0.4.3"
def rotate_right(array,positions) do
cond do
(nil == array or length(array) < 2) -> array
(nil == positions or !(positions > 0)) -> array
(rem(positions,length(array)) == 0) -> array
true -> rotate_right_positions(array,rem(positions,length(array)),0)
end
end
@doc """
Rotates an ```array``` X ```positions``` in direction from right to left.
A initial array [1,2,3,4] turn in [4,1,2,3] if rotate ```positions``` equal
to 1.
## Examples
```elixir
iex > Krug.ArrayUtil.rotate_left(nil,1)
nil
```
```elixir
iex > Krug.ArrayUtil.rotate_left([],1)
[]
```
```elixir
iex > Krug.ArrayUtil.rotate_left([1],2)
[1]
```
```elixir
iex > Krug.ArrayUtil.rotate_left([1,2,3,4],1)
[4,1,2,3]
```
```elixir
iex > Krug.ArrayUtil.rotate_left([1,2,3,4],3)
[2,3,4,1]
```
"""
@doc since: "0.4.3"
def rotate_left(array,positions) do
cond do
(nil == array or length(array) < 2) -> array
(nil == positions or !(positions > 0)) -> array
(rem(positions,length(array)) == 0) -> array
true -> rotate_left_positions(array,rem(positions,length(array)),0)
end
end
defp rotate_right_positions(array,positions,count) do
cond do
(count >= positions) -> array
true -> rotate_right_one_position(array) |> rotate_right_positions(positions,count + 1)
end
end
defp rotate_right_one_position(array) do
[(array |> hd()) | (array |> tl() |> Enum.reverse())] |> Enum.reverse()
end
defp rotate_left_positions(array,positions,count) do
cond do
(count >= positions) -> array
true -> rotate_left_one_position(array) |> rotate_left_positions(positions,count + 1)
end
end
defp rotate_left_one_position(array) do
array = array |> Enum.reverse()
[(array |> hd()) | (array |> tl() |> Enum.reverse())]
end
end