Functions Reference

Logical functions
F
ILEMAKER FUNCTIONS REFERENCE 230
The following example shows how to pass named parameters, while keeping the ability to check the
syntax of the second parameter of the
Let function (the example returns 6, 12):
ScriptParameter = "a = 5; b = 10"
Let( [a = Evaluate("Let( [" & Get(ScriptParameter) & "]; a )"),
b = Evaluate("Let( [" & Get(ScriptParameter) & "]; b )")]; a + 1
& ", " & b + 2 )
Note The Evaluate function evaluates an expression, including field values to be evaluated as a
calculation formula. It also allows you to specify field dependencies so that a calculation using the
evaluation function can be triggered due to changes in other fields of the same record. This function
evaluates user-defined formulas. For example, you can create a formula in the Total field that
computes state tax:
Evaluate(StateTaxFormula) + ShippingCost
where the StateTaxFormula field contains:
SubTotal * 1.0875
and the SubTotal field contains the subtotal before tax and shipping.
The Evaluate function has an optional second parameter, which is a field the calculation is
dependent on. When the dependent field contents change, FileMaker
Pro re-evaluates the
calculation. In the following example, the Total calculation will be re-evaluated when SubTotal
changes:
Evaluate(StateTaxFormula; SubTotal) + ShippingCost
The dependent parameter can also be useful in other cases. For example,
Evaluate(“Get(CurrentTimeStamp)”; [FieldB; FieldC])
will store a timestamp in the calculation field whenever FieldB or FieldC changes.