Skip to content

Drop

Name - Description Default Type
<input> Any input is ignored. Any
<output> The input to this shard is passed through as its output. Any
Name The name of the variable. "" String&Any
Key The key of the value to read from the table (parameter applicable only if the target variable is a table). None String&String
Global If the variable is available to all of the wires in the same mesh. false Bool

Drops the last element of the sequence variable passed in the :Name parameter. Works only on sequences.

Details

Drop drops (removes) the last element of the sequence variable that has been passed to in the :Name parameter.

This shard works on both sequences and tables. Parameter :Key applies only to tables.

Since variables may be locally scoped (created with (:Global false); exists only for current wire) or globally scoped (created with (:Global true); exists for all wires of that mesh), both parameters :Global and :Name are used in combination to identify the correct variable to drop elements from.

Any input to this shard is ignored and instead passed through as its output.

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
;; drop last element from a local sequence
[10 20 30 40] >= .seq           ;; create a local sequence
(Get .seq) (Log)                ;; local sequence => [10, 20, 30, 40]
(Drop :Name .seq)               ;; drops the last element i.e., 40
(Get .seq) (Log)                ;; updated sequence => [10, 20, 30]

;; drop last element from a same-name global sequence
[11 21 31 41] >== .seq          ;; create a same-name global sequence
(Get .seq :Global true) (Log)   ;; local sequence => [11, 21, 31, 41]
(Drop :Name .seq)               ;; drops the last element i.e., 41
(Get .seq :Global true) (Log)   ;; updated sequence => [11, 21, 31]
[info] Set - Warning: setting an already exposed variable "seq", use Update to avoid this warning.
[info] [shards/General/Drop/Drop.edn] [10 20 30 40]
[info] [shards/General/Drop/Drop.edn] [10 20 30]
[info] [shards/General/Drop/Drop.edn] [11 21 31 41]
[info] [shards/General/Drop/Drop.edn] [11 21 31 41]