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What does it mean to write a function that "returns values that can be used by client code"?
I'm going through the last few exercises of the Computer Science A-level course at my university, and I'm struck by a sentence in one of them:
What we have a have created is a function that returns values that can be used by client code to call methods on the class.
This is quoted from the chapter on creating public methods.
I'm not quite sure how to make sense of it. I understand that a method is just a function that takes arguments and returns some value, which is ultimately what makes methods. But I don't understand what the part about "client code" means, or what other methods the class has to offer in order for the method to be used.
As far as I can see, the only "client code" in this example is what the teacher wrote, which is a foreach loop.
In this context, client code is any code that can be given to the object for it to call a method on.
i.e. given the iterable sequence:
Lets say you have a subclass of String called Person, which is a "class of object that defines a set of attributes and one or more operations on those attributes" (Python's SimpleWikipedia Article).
We can define a subclass of Person:
Now, our Person object can have a list of students, in which case that is the object's Client Code:
mystring = "Joe"
some_list = ['Dave', 'Barney', 'Fred']
student_list = [ Student(name=some_string, surname=other_string) for some_string in some_list]
Now we have a list of students, that we can use to call the method() method of the Student class to which they belong. It would be like calling Person.name() or Person.surname() on each student
Now, our class Student also has a number of other methods like full_name() or get_name_surname() etc. which are client methods that work on the variable that gets returned from the method called on 0b46394aab