As described above in the Vocabulary section, there are four types of parameters you can define: Switches, FlaggedOptions, UnflaggedOptions, and QualifiedSwitches. When you define a parameter, you tell JSAP what flags (if any) it uses, what its default values are, whether it is required, what its ID is, and other relevant information. See the individual sections below for each type of parameter for details. If you're using SimpleJSAP, parameters are usually declared as an array in the constructor.