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11. The Power of Variable Names
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each with a particular meaning is arbitrary and confusing. Frd could just as easily be associated with final review duty and FRD with full revenue disbursal, and no logical rule will help you or anyone else to remember which is which.
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Avoid multiple natural languages In multi-national projects, enforce use of a single natural language for all code including class names, variable names, and so on. Reading another programmer s code can be a challenge; reading another programmer s code in Southeast Martian is impossible. Avoid the names of standard types, variables, and routines All programming-language guides contain lists of the language s reserved and predefined names. Read the list occasionally to make sure you re not stepping on the toes of the language you re using. For example, the following code fragment is legal in PL/I, but you would be a certifiable idiot to use it:
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if if = then then then = else; else else = if;
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Don t use names that are totally unrelated to what the variables represent Sprinkling names such as margaret and pookie throughout your program virtually guarantees that no one else will be able to understand it. Avoid your boyfriend s name, wife s name, favorite beer s name, or other clever (aka silly) names for variables, unless the program is really about your boyfriend, wife, or favorite beer. Even then, you would be wise to recognize that each of these might change, and that therefore the generic names boyFriend, wife, and favoriteBeer are superior! Avoid names containing hard-to-read characters Be aware that some characters look so similar that it s hard to tell them apart. If the only difference between two names is one of these characters, you might have a hard time telling the names apart. For example, try to circle the name that doesn t belong in each of the following sets:
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eyeChartl TTLCONFUSION hard2Read GRANDTOTAL ttl5 eyeChartI TTLCONFUSION hardZRead GRANDTOTAL ttlS eyeChartl TTLC0NFUSION hard2Read 6RANDTOTAL ttlS
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Pairs that are hard to distinguish include (1 and l), (1 and I), (. and ,), (0 and O), (2 and Z), (; and :), (S and 5), and (G and 6).
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11. The Power of Variable Names
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Do details like these really matter Indeed! Gerald Weinberg reports that in the 1970s, a comma was used in a Fortran FORMAT statement where a period should have been used. The result was that scientists miscalculated a spacecraft s trajectory and lost a space probe to the tune of $1.6 billion (Weinberg 1983).
CC2E.COM/ 1191 CROSS-REFERENCE For 7 considerations in using data,
CHECKLIST: Naming Variables
General Naming Considerations
see the checklist in 8 10, General Issues in Using Variables.
Does the name fully and accurately describe what the variable represents Does the name refer to the real-world problem rather than to the programming-language solution Is the name long enough that you don t have to puzzle it out Are computed-value qualifiers, if any, at the end of the name Does the name use Count or Index instead of Num
Naming Specific Kinds Of Data
Are loop index names meaningful (something other than i, j, or k if the loop is more than one or two lines long or is nested) Have all temporary variables been renamed to something more meaningful Are boolean variables named so that their meanings when they re True are clear Do enumerated-type names include a prefix or suffix that indicates the category for example, Color_ for Color_Red, Color_Green, Color_Blue, and so on Are named constants named for the abstract entities they represent rather than the numbers they refer to
Naming Conventions
Does the convention distinguish among local, class, and global data Does the convention distinguish among type names, named constants, enumerated types, and variables Does the convention identify input-only parameters to routines in languages that don t enforce them Is the convention as compatible as possible with standard conventions for the language Are names formatted for readability
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