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Avoid variables with these kinds of hidden meanings. The technical name for this kind of abuse is hybrid coupling (Page-Jones 1988). The variable is stretched over two jobs, meaning that the variable is the wrong type for one of the jobs. In the pageCount example above, pageCount normally indicates the number of pages; it s an integer. When pageCount is -1, however, it indicates that an error has occurred; the integer is moonlighting as a boolean! Even if the double use is clear to you, it won t be to someone else. The extra clarity you ll achieve by using two variables to hold two kinds of information will amaze you. And no one will begrudge you the extra storage.
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Make sure that all declared variables are used The opposite of using a variable for more than one purpose is not using it at all. A study by Card, Church, and Agresti found that unreferenced variables were correlated with higher fault rates (1986). Get in the habit of checking to be sure that all variables that are declared are used. Some compilers and utilities (such as lint) report unused variables as a warning. CHECKLIST: General Considerations In Using Data
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CC2E.COM/ 1092 CROSS-REFERENCE For 0 a checklist that applies to
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specific types of data rather than general issues, see the checklist in 12, Fundamental Data Types. For issues in naming variables, see the checklist in 11, The Power of Variable Names.
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Does each routine check input parameters for validity Does the code declare variables close to where they re first used Does the code initialize variables as they re declared, if possible Does the code initialize variables close to where they re first used, if it isn t possible to declare and initialize them at the same time Are counters and accumulators initialized properly and, if necessary, reinitialized each time they are used
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10. General Issues in Using Variables
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Page 23
Are variables reinitialized properly in code that s executed repeatedly Does the code compile with no warnings from the compiler If your language uses implicit declarations, have you compensated for the problems they cause
Other General Issues in Using Data
Do all variables have the smallest scope possible Are references to variables as close together as possible both from each reference to a variable to the next and in total live time Do control structures correspond to the data types Are all the declared variables being used Are all variables bound at appropriate times, that is, striking a conscious balance between the flexibility of late binding and the increased complexity associated with late binding Does each variable have one and only one purpose Is each variable s meaning explicit, with no hidden meanings
Key Points
Data initialization is prone to errors, so use the initialization techniques described in this chapter to avoid the problems caused by unexpected initial values. Minimize the scope of each variable. Keep references to it close together. Keep it local to a routine or class. Avoid global data. Keep statements that work with the same variables as close together as possible. Early binding tends to limit flexibility, but minimize complexity. Late binding tends to increase flexibility, but at the price of increased complexity. Use each variable for one and only one purpose.
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11. The Power of Variable Names
Page 1
The Power of Variable Names
Contents 11.1 Considerations in Choosing Good Names
11.2 Naming Specific Types of Data 11.3 The Power of Naming Conventions 11.4 Informal Naming Conventions 11.5 Standardized Prefixes 11.6 Creating Short Names That Are Readable 11.7 Kinds of Names to Avoid
4 CC2E.COM/ 1184
Related Topics Routine names: Section 7.3
Class names: Section 6.2 General issues in using variables: 10 Formatting data declarations: Laying Out Data Declarations in Section 31.5 Documenting variables: Commenting Data Declarations in Section 32.5 AS IMPORTANT AS THE TOPIC OF GOOD NAMES IS to effective programming, I have never read a discussion that covered more than a handful of the dozens of considerations that go into creating good names. Many programming texts devote a few paragraphs to choosing abbreviations, spout a few platitudes, and expect you to fend for yourself. I intend to be guilty of the opposite, to inundate you with more information about good names than you will ever be able to use!
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