9.3. Functions for objects

In the next few sections, I will demonstrate several possible interfaces for functions that operate on objects. For some operations, you will have a choice of several possible interfaces, so you should consider the pros and cons of each of these:

pure function:

Takes objects and/or basic types as arguments but does not modify the objects. The return value is either a basic type or a new object created inside the function.

modifier:

Takes objects as parameters and modifies some or all of them. Often returns void.

fill-in function:

One of the parameters is an “empty” object that gets filled in by the function. Technically, this is a type of modifier.

Q-1: Match the term to its definition. Try again.
• pure function
• Does not modify objects. The return values is either a basic type or a new object that was create in the function. Takes objects and/or basic types as arguments.
• modifier
• Often returns void. Modifies some or all parameters. Takes objects as parameters.
• fill-in function
• Technically a type of modifier. One of the parameters is an "empty" object that gets filled in by the function.

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