Support negative index

vic · Dec 20, 2016 · 4977c0b · 4977c0b
1 parent 6b68d6b
commit 4977c0b
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diff --git a/lib/indifferent.ex b/lib/indifferent.ex
@@ -72,6 +72,9 @@ defmodule Indifferent do
     iex> [1, {2, 3}] |> Indifferent.path([1][0])
     2
 
+    iex> [1, [2, 3]] |> Indifferent.path([1][-1])
+    3
+
     iex> [9, %{"c" => {:ok, %{"e" => 4}}}] |> Indifferent.path(1.c["1"].e)
     4
 

diff --git a/lib/indifferent/path.ex b/lib/indifferent/path.ex
@@ -14,6 +14,10 @@ defmodule Indifferent.Path do
     expand(a, []) ++ expand(b, seen)
   end
 
+  def expand(a = {:-, _, _}, seen) do
+    [a | seen]
+  end
+
   def expand({a, _, nil}, seen) do
     [a | seen]
   end