The simplest definition says that a module is a logical group of code (e.g. a namespace, a package, an isolated group of classes or even a single class). It shouldn’t be confused with a component, which is a physical group of code (e.g. a library, an executable or a service). Although not everybody agrees with this definition (see Vlad Khononov’s Balancing Coupling book), it’s still practical enough to be useful.
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func (opt *Option) ArgFloat64Var(val *float64) error