Catamorphism: Difference between revisions

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 # leaves the nesting depth unchanged for any other character
 # updates the accumulator no further if the nesting depth ever becomes negative.
-Or for a simple count of bracket characters in a string, ignoring other characters, we could instead use FOLDLROW with an alternative binary operator like:
-<lang lisp>bracketCount
-=LAMBDA(a,
-    LAMBDA(c,
-        IF(ISNUMBER(FIND(c, "[]", 1)),
-+ a,
-            a
-        )
-    )
-)</lisp>
@@ Line 701: / Line 688: @@
             ),
             depth
+        )
+    )
+)
+bracketCount
+=LAMBDA(a,
+    LAMBDA(c,
+        IF(ISNUMBER(FIND(c, "[]", 1)),
++ a,
+            a
         )
     )