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+---
+title: Sequences and Procedures
+menuTitle: Sequences
+weight: 6
+---
+Sequences and procedures are the same thing. These are named lists of
+instructions and values, which can be called upon at any point where
+instructions can be used. They can take parameters.
+
+Procedures do not return values. It is however possible to emulate something
+similar, by passing a pointer as a parameter and storing a "return" value into
+it.
+
+These are also intended to be used to describe scenes.
+
+The execution of a sequence can be terminated by using the `(done)`
+instruction.  The execution of the narrative can be terminated by using the
+`(end)` instruction.
+
+Any value not part of an instruction will simply be displayed when it is
+reached during the procedure's execution.
+
+Sequences can be used before their definition, the compiler will raise an error
+if the use ends up being incorrect.
+
+Execution of a sequence can be started in two ways: `(call sequence_name)` will
+execute the sequence then continue with the execution of the current
+instruction list; `(jump_to sequence_name)` will replace the current
+instruction list by the execution of the sequence. If one were to ignore
+variables, the `(jump_to sequence_name)` instruction is similar to performing
+`(call sequence_name) (done)`.
+
+{{< fatecode >}}(define_sequence {String} (([C0 = TYPE] {V0 = String}) ... ([CN = TYPE] {VN = String})) [I0 = INSTRUCTIONS|VALUE] ... [IM = INSTRUCTIONS|VALUE]){{< /fatecode >}}
+**Effect:** Defines the sequence `{String}`, with variables `V0` ... `VN` of types `C0` ...`CN` as parameters, and instructions `I0` ... `IM` as content.
+
+**Acceptable Aliases:** `declare_sequence`, `def_seq`, `define_procedure`, `declare_procedure`, `def_proc`.
+
+#### Examples
+{{< fatecode >}}(define_sequence in_your_room ()
+   (ifelse
+      (is_member visited_your_room progress)
+      (text_effect narrator
+         You room is still a mess. You don't have time to clean things up,
+         though.
+      )
+      (text_effect narrator
+         You room is a mess. You recall having been through every drawer while
+         preparing your bag yesterday. While still unclear on how you are
+         supposed to pack all the necessary things for what promises to be at
+         least a year-long journey inside a small backpack, you cannot avoid
+         but wasting more time contemplating the piles of items that didn't
+         make the cut.
+      )
+   )
+   (add visited_your_room progress)
+   (player_choice
+      (
+         ( Look for healing items )
+         (jump_to look_for_healing_items)
+      )
+      (
+         ( No time! Let's go adventuring! )
+         (jump_to leave_your_room)
+      )
+   )
+)
+{{< /fatecode >}}
+
+{{< fatecode >}}(define_sequence index_of_loop
+   (
+      ((ptr int) result_holder)
+      ((list int) collection)
+      (int target)
+   )
+   (local int collection_size)
+   (local int i)
+
+   (set collection_size (size collection))
+
+   (for (set i 0) (< (var i) (var collection_size)) (set i (+ (var i) 1))
+      (if (= (access collection (var i)) (var target))
+         (
+            (set (at result_holder) (var i))
+            (done)
+         )
+      )
+   )
+   (set (at result_holder) -1)
+)
+{{< /fatecode >}}
+
+
+{{< fatecode >}}(define_sequence index_of_jump
+   (
+      ((ptr int) result_holder)
+      ((list int) collection)
+      (int target)
+      (int i)
+      (int collection_size)
+   )
+   (ifelse (= (var i) (var collection_size))
+      (set (at result_holder) -1)
+      (ifelse (= (access collection (var i)) (var target))
+         (set (at result_holder) (var i))
+         (jump index_of_jump
+            (var result_holder)
+            (var collection)
+            (var target)
+            (+ (var i) 1)
+            (var collection_size)
+         )
+      )
+   )
+)
+{{< /fatecode >}}