delete -package:snap-core

delete x removes the first occurrence of x from its list argument. It is a special case of deleteBy, which allows the programmer to supply their own equality test.

Examples

>>> delete 'a' "banana"
"bnana"

>>> delete "not" ["haskell", "is", "not", "awesome"]
["haskell","is","awesome"]

Delete a key and its value from the map. When the key is not a member of the map, the original map is returned.

delete 5 (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
delete 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
delete 5 empty                         == empty

Delete a value in the set. Returns the original set when the value was not present.

Delete a key and its value from the map. When the key is not a member of the map, the original map is returned.

delete 5 (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
delete 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
delete 5 empty                         == empty

Delete an element from a set.

Remove the mapping for the specified key from this map if present.

Remove the mapping for the specified key from this map if present.

Delete an element at the given position in this array, decreasing its size by one.

Remove the specified value from this set if present.

>>> HashSet.delete 1 (HashSet.fromList [1,2,3])
fromList [2,3]

>>> HashSet.delete 1 (HashSet.fromList [4,5,6])
fromList [4,5,6]

Delete a key and its value from the map. When the key is not a member of the map, the original map is returned.

delete 5 (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
delete 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
delete 5 empty                         == empty

Delete a value in the set. Returns the original set when the value was not present.

Delete a specific record by identifier. Does nothing if record does not exist.

Example usage

With schema-1 and dataset-1,

deleteSpj :: MonadIO m => ReaderT SqlBackend m ()
deleteSpj = delete spjId

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+

Remove an element of the given keys from the metadatas. If not present does nothing.

Issue a DELETE request. Example:

delete "http://httpbin.org/delete"

>>> r <- delete "http://httpbin.org/delete"

>>> r ^. responseStatus . statusCode
200

Session-specific version of delete.

delete = addroute DELETE

delete = addroute DELETE

Deletes a key-value mapping from a hash table. O(n) worst case, O(1) amortized.