Exclusion; unique keys.

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/utils.coffee b/lib/utils.coffee
index b7f8731a..81b0fb49 100644
--- a/lib/utils.coffee
+++ b/lib/utils.coffee
@@ -110,6 +110,12 @@ Utils =
   # detects both literals and dynamically created strings
   isString: (obj) -> typeof obj == 'string' or obj instanceof String
 
+  # Transform "zjkjkabz" into "abjkz".
+  uniqueCharacters: (str) ->
+    unique = ""
+    for char in str.split("").sort()
+      unique += char unless 0 <= unique.indexOf char
+    unique
 
   # Compares two version strings (e.g. "1.1" and "1.5") and returns
   # -1 if versionA is < versionB, 0 if they're equal, and 1 if versionA is > versionB.