Variables with local scope, also known as
local variables, are declared using the Local keyword followed by the type name
(with the Var suffix) followed by the variable name as in the above examples.
Local variables are restricted to a single
formula and a single evaluation of that formula. This means that you cannot
access the value of a local variable in one formula from a different formula.
Example
//Formula A
Local NumberVar x;
x := 10;
//Formula B
EvaluateAfter ({@Formula A})
Local NumberVar x;
x := x + 1;
The function call EvaluateAfter
({@Formula A}) ensures that Formula B will be evaluated after Formula A is
evaluated. Formula A returns a value of 10 and Formula B returns a value of 1.
Formula B does not have access to Formula A's x and thus cannot use the value
of 10 and add 1; instead, it uses the default value for the uninitialized local
variable x found in Formula B, which is 0, and adds 1 to it to get 1.
You can also create local variables with
the same name but different types in different formulas. For example, the type
declarations in formulas A and B do not conflict with:
//Formula C
Local StringVar x := "hello";
Local variables are the most efficient
of the three scopes. They also do not interfere with one another in different
formulas. For these reasons, it is best to declare variables to be local
whenever possible.