In Go, the errors are nothing but an interface type where any type implementing the single Error() method is considered as an error. Go does not have try/catch methods as in other programming languages for handling the errors. They are instead returned as normal values. Following is the syntax for creating the error interface:
type error_name interface {
Error() string
}
We use this whenever we apprehend that there are possibilities where a function can go wrong during type conversions or network calls. The function should return an error as its return variable if things go wrong. The caller has to check this error value and identify the error. Any value other than nil is termed as an error.
As part of good error handling practices, guard classes should be used over if-else statements. They should also be wrapped in a meaningful way as they can be passed up in the call stack. Errors of the same types should not be logged or handled multiple times.
