Handling Errors in Go
Understand Go's unique error handling approach by learning to create basic and custom errors, detect specific error types, and wrap or unwrap errors. This lesson equips you with essential skills to write reliable, error-resilient Go programs by mastering common patterns critical for debugging and maintenance.
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Many of us come from languages that handle errors using exceptions. Go takes a different approach, treating errors like our other data types. This prevents common problems that exception-based models have, such as exceptions escaping up the stack.
Go has a built-in error type called error. It is based on the interface type, with the following definition:
Now, let's look at how we can create an error.
Creating an error
The most common way to create errors is using either the errors package's New() method or the fmt package's Errorf() method. Use errors.New() when we don't need to do variable substitution and fmt.Errorf() when we do. We can see both methods in the following code snippet:
In both the preceding examples, err will be of type error. ...