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+---
+title: Variables
+weight: 3
+---
+Variables are what hold values. Each variable has a type, which cannot be
+changed.
+
+There are two variable scopes: local and global. A global variable can only be
+declared outside of any sequence. A local variable can also be declared within a
+sequence. Local variables can only be accessed within their context. In effect,
+a local variable declared outside of a sequence cannot be accessed in any
+sequence, and local variables cannot be accessed within lambda functions. Local
+variables can override global variables within their context.
+
+The sole exception to accessing a local variable outside its context is done
+through the use of pointers. Local variables live as long as the context
+that declared them does. Accessed one through a pointer past that point is
+likely to result in a runtime error and is, in any case, not to be done.
+
+Each sequence and lambda function defines its own context and thus does not
+share local variable with the others. Instructions which themselves contain
+instructions define hierarchies. Local variables defined within a hierarchical
+level can be accessed in that level and inner level, but are not shared with
+outer levels. For example:
+
+{{< fatecode >}}(if_else (var my_test)
+   (
+      (local int my_var) ;; my_var (a)
+      (set my_var 32)
+   )
+   (
+      ;; my_var (a) is not defined here.
+      (local int my_var) ;; my_var (b)
+      (set my_var 42)
+      (if (var my_other_test)
+         (
+            (local int my_other_var)
+            ;; Both my_other_var and my_var (b) are defined here
+         )
+      )
+      ;; only my_var (b) is defined here
+   )
+)
+{{< /fatecode >}}
+
+Generic instruction lists do not generate a new level of hierarchy:
+
+{{< fatecode >}}(
+   (local int my_var)
+)
+;; my_var is still defined.
+{{< /fatecode >}}
+
+### LOCAL VARIABLE
+{{< fatecode >}}(local [TYPE] {Identifier}){{< /fatecode >}}
+Declares the local variable `{Identifier}` of type `[TYPE]`.
+
+### GLOBAL VARIABLE
+{{< fatecode >}}(global [TYPE] {Identifier}){{< /fatecode >}}
+Declares the global variable `{Identifier}` of type `[TYPE]`.
+
+## Example
+{{< fatecode >}}(local string name_of_dog)
+
+(global (ptr int) index_of_result)
+
+;; Here is an amusing use of variables:
+(global int something_unexpected)
+(local int something_unexpected)
+;; something_unexpected will not be the same variable within processes (which
+;; will use the global variable) and outside of them (which will use the local
+;; variable). For code readability reasons, I do not recommend doing this.
+{{< /fatecode >}}