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Task/Range-extraction/LiveCode/range-extraction-1.livecode

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+function rangeExtract nums
+    local prevNum, znums, rangedNums
+    set itemDelimiter to ", "
+    put the first item of nums into prevNum
+    repeat for each item n in nums
+        if n is (prevNum + 1) then
+            put n into prevNum
+            put "#" & n after znums
+        else
+            put n into prevNum
+            put return & n after znums
+        end if
+    end repeat
+    set itemDelimiter to "#"
+    repeat for each line z in znums
+        if z is empty then next repeat
+        switch the number of items of z
+            case 1
+                put z & "," after rangedNums
+                break
+            case 2
+                put item 1 of z & "," & item -1 of z & "," after rangedNums
+                break
+            default
+                put item 1 of z & "-" & item -1 of z & "," after rangedNums
+        end switch
+    end repeat
+    return char 1 to -2 of rangedNums  --strip off trailing comma
+end rangeExtract