You should almost never use it as a subject of something or a way parameter.
So the answer is particular to non-obligatory: it is not "a well-known reason maybe kind"; as such, it is restrained, and it could be constrained in methods that restrict its usefulness as a subject type or a parameter kind.
Non-obligatory Parameters are parameters that can be precise, however, aren't required.
This allows for capabilities that might be greater customizable, without requiring parameters that many customers will not need.
A method that includes non-compulsory parameters does not force to skip arguments at calling time. It manner we call technique without passing the arguments.
The optional parameter carries a default cost in the characteristic definition.
If we do not pass elective argument cost at calling time, the default price is used.
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