First class environments: Difference between revisions

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@@ Line 694: / Line 694: @@
-Finally, to present the results in tabular form, two helper functions will be useful:
+Finally, to present the results in tabular form, the following helper function will be useful:
-   # Emit the last item in a stream
-   # or null if the stream is empty
-   def last(s): reduce s as $s (null; $s);
    # Apply a filter to a stream,
    # and ALSO emit the last item in the stream filtered through "final"
    def filter_and_last(s; filter; final):
-     (s | filter), (last(s) | final);
+     [s] as $array
+     | ($array[] | filter), ($array[-1] | final);