error vs errors
Handling errors is a crucial part of writing robust programs. When scanning the Go packages, it is not rare to see APIs which have multiple return values with an error among them. For example:
func Open(name string) (*File, error)
Open opens the named file for reading. If successful, methods on the returned file can be used for reading; the associated file descriptor has mode O_RDONLY. If there is an error, it will be of type *PathError.
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