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).

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

• 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

def
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