Assigned function

Tests if a variable has been assigned. Returns the opposite values from unassigned().

truefalse = Assigned(variable)

The Assigned function is used to determine whether a value has been assigned to a variable. You can avoid "variable not assigned a value" (VNAV) errors, by making sure that any variable you reference in your code has, at minimum, a null value.

Note: A null value is different from an unassigned value. A null value is a known, assigned value of'' . If a variable is unassigned it has an unknown value.

Note: The unassigned() function requires a function declaration. The assigned() function does not require a function declaration.

True (1) if variable is assigned; false (0) if variable is unassigned.

unassigned()

function RowExists(Table, Key)
$insert Logical
Exists = FALSE$
if assigned(Table) and assigned(Key) then
  open Table to Handle then
    read Row from Handle, Key then
      Exists = TRUE$
    end
  end
end
return Exists
 
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