diff --git a/langutils.nim b/langutils.nim
index 0972a9a..f5dfc9f 100644
--- a/langutils.nim
+++ b/langutils.nim
@@ -26,7 +26,18 @@ proc sameContents*[T](a1, a2: openArray[T]): bool =
     if not a2.anyIt(a == it): return false
   return true
 
-template doWhile(a, b: untyped): untyped =
+template indexOf*(s, pred: untyped): int =
+  var foundIdx = -1
+  var idx = 0
+  for it {.inject.} in items(s):
+    if pred:
+      foundIdx = idx
+      break
+    idx += 1
+  foundIdx
+
+template doWhile*(a, b: untyped): untyped =
   b
   while a:
     b
+
diff --git a/langutils.nimble b/langutils.nimble
index 5cd1cde..1f1ce39 100644
--- a/langutils.nimble
+++ b/langutils.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.0"
+version       = "0.4.0"
 author        = "Jonathan Bernard"
 description   = "Language extensions (templates, macros) I commonly use."
 license       = "MIT"