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Rules for naming a variableA variable name can only have letters (both uppercase and lowercase letters), digits and underscore. The first letter of a variable should be either a letter or an underscore. There is no rule on how long a variable name (identifier) can be.
Variable names are shown in green color in the questionnaire Designer. The following are examples of valid variable names: age, gender, x25, age_of_hh_head. The following are examples of invalid variable names: age_ (ends with an underscore);
Most surveys use one of three methods for naming variables: cryptic codes, question numbers (e.g. “1”, “2”, “3” or “A1”, “A2a”, “A2b”) or descriptive names (e.g., “gender”, “age”, “employment”).
function startEditing(){ if (user.canEdit(currentDocument)){ editorControl.setEditMode(true); setButtonDown(btnStartEditing); } } Should read like a narrative work.
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One rule I always follow is this: if a variable encodes a value that is in some particular units, then those units have to be part of the variable name. Example:
int postalCodeDistanceMiles; decimal reactorCoreTemperatureKelvin; decimal altitudeMsl; int userExperienceWongBakerPainScale I will NOT be responsible for crashing any Mars landers (or the equivalent failure in my boring CRUD business applications).
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