The error Data Type
Let’s learn about the error data type.
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The error interface
Let’s revisit the error data type, which is an interface defined as follows:
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type error interface {Error() string}
So, in order to satisfy the error interface, we just need to implement the Error() string type method. This does not change the way we use errors to find out whether the execution of a function or method was successful or not, but it shows how important interfaces are in Go as they are being used transparently all the time. However, the crucial question is when we should implement the error interface on our own instead of using the default one. The answer to that question is when we want to give more context to an error condition.