del t v

Delete the first instance of value v in table t
The remaining entries are shifted left one index to avoid holes.
Note that v is the value of the item to be deleted, not the index into the table.
(To remove an item at a particular index, use deli instead)
del returns the deleted item, or returns no value when nothing was deleted.

A={1,10,2,11,3,12}
FOR ITEM IN ALL(A) DO
IF (ITEM < 10) THEN DEL(A, ITEM) END
END
FOREACH(A, PRINT) -- 10,11,12
PRINT(A[3]) -- 12

deli t [i]

Like del(), but remove the item from table t at index i.
When i is not given, the last element of the table is removed and returned.