def()

Returns the first valid parameter from left to right.

A parameter is considered valid if it is a finite number or a non-empty string.

None or invalid values are skipped.

If no parameter is valid, the function returns the last parameter provided (which may be None, empty string, or infinite).

Syntax

def(value1, value2, [value3, ...])

Parameter	Type	Description
value1..N	Number/String/None	Evaluated in order. Returns the first finite number or non-empty string found.

The first finite number or non-empty string among the parameters.
If all parameters are None, infinite, or empty strings, it returns the last parameter.

def(nan(), none(), 2, 3, 4); // returns 2 as the first finite number

def(none(), "", "Hello", "World"); // returns "Hello" as the first non-empty string

def(none(), nan()); // returns the last parameter (infinite) because no valid value found