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32. Self-Documenting Code
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Contents 32.1 External Documentation
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32.2 Programming Style as Documentation 32.3 To Comment or Not to Comment 32.4 Keys to Effective Comments 32.5 Commenting Techniques
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Related Topics Layout: 31
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The Pseudocode Programming Process: 9 High quality classes: 6 High-quality routines: 7 Programming as communication: Sections 33.5 and 34.3
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Code as if whoever maintains your program is a violent psychopath who knows where you live. Anonymous
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MOST PROGRAMMERS ENJOY WRITING DOCUMENTATION if the documentation standards aren t unreasonable. Like layout, good documentation is a sign of the professional pride a programmer puts into a program. Software documentation can take many forms, and, after describing the sweep of the documentation landscape, this chapter cultivates the specific patch of documentation known as comments.
32.1 External Documentation
Documentation on a software project consists of information both inside the source-code listings and outside them usually in the form of separate documents or unit development folders. On large, formal projects, most of the documentation is outside the source code (Jones 1998). External construction documentation tends to be at a high level compared to the code, at a low level compared to the documentation from problem definition, requirements, and architecture.
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9 FURTHER READING For a
detailed description, see The Unit Development Folder (UDF): An Effective Management Tool for Software Development (Ingrassia 1976) or The Unit Development Folder (UDF): A Ten-Year Perspective (Ingrassia 1987).
Unit development folders A Unit Development Folder (UDF), or software-development folder (SDF), is an informal document that contains notes used by a developer during construction. A unit is loosely defined, usually to mean a class. The main purpose of a UDF is to provide a trail of design decisions that aren t documented elsewhere. Many projects have standards that specify the minimum content of a UDF, such as copies of the relevant requirements, the parts of the top-level design the unit implements, a copy of the development standards, a current code listing, and design notes from the unit s developer. Sometimes the customer requires a software developer to deliver the project s UDFs; often they are for internal use only. Detailed-design document The detailed-design document is the low-level design document. It describes the class-level or routine-level design decisions, the alternatives that were considered, and the reasons for selecting the approaches that were selected. Sometimes this information is contained in a formal document. In such cases, detailed design is usually considered to be separate from construction. Sometimes it consists mainly of developer s notes collected into a Unit Development Folder (UDF). Sometimes often it exists only in the code itself.
32.2 Programming Style as Documentation
In contrast to external documentation, internal documentation is found within the program listing itself. It s the most detailed kind of documentation, at the sourcestatement level. Because it s most closely associated with the code, internal documentation is also the kind of documentation most likely to remain correct as the code is modified. The main contributor to code-level documentation isn t comments, but good programming style. Style includes good program structure, use of straightforward and easily understandable approaches, good variable names, good routine names, use of named constants instead of literals, clear layout, and minimization of control-flow and data-structure complexity. Here s a code fragment with poor style:
CODING HORROR
Java Example of Poor Documentation Resulting from Bad Programming Style
for ( i = 1; i <= num; i++ ) { meetsCriteria[ i ] = True; }
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for ( i = 2; i <= num / 2; i++ ) { j = i + i; while ( j <= num ) { meetsCriteria[ j ] = False; j = j + i; } } for ( i = 1; i <= num; i++ ) { if ( meetsCriteria[ i ] ) { System.out.println ( i + " meets criteria." ); } }
What do you think this routine does It s unnecessarily cryptic. It s poorly documented not because it lacks comments, but because it lacks good programming style. The variable names are uninformative, and the layout is crude. Here s the same code improved just improving the programming style makes its meaning much clearer:
In this code, the variable FactorableNumber is added solely for the sake of clarifying the operation. For details on adding variables to clarify operations, see "Making Complicated Expressions Simple" in Section 19.1.
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