--- a/Collection.st	Sat Sep 22 11:19:14 2018 +0200
+++ b/Collection.st	Sat Sep 22 11:21:23 2018 +0200
@@ -2703,12 +2703,12 @@
     "
 !
 
-collectColumn:columnNumber
-    "for each row-element in the receiver (which ought to be sequencable), 
-     retrieve the indexed element at columnNumber,
+collectColumn:columnNumberOrKey
+    "for each row-element in the receiver (which ought to be indexable by columnNumberOrKey), 
+     retrieve the indexed element at columnNumberOrKey,
      and return a new collection with those column values"
 
-    ^ self collect:[:el | el at:columnNumber].
+    ^ self collect:[:el | el at:columnNumberOrKey].
 
     "
      #((1 one) (2 two) (3 three) (4 four)) collectColumn:1