How Can I Elegantly Handle Multiple Errors in Go?

Handling Multiple Errors Elegantly in Go

In Go, handling multiple errors can become cumbersome when numerous operations can lead to errors. One approach to alleviate this issue is to leverage the key-value store provided by the error type.

Consider the following code snippet:

aJson, err1 := json.Marshal(a)
bJson, err2 := json.Marshal(b)
cJson, err3 := json.Marshal(c)
dJson, err4 := json.Marshal(d)
eJson, err5 := json.Marshal(e)
fJson, err6 := json.Marshal(f)
gJson, err4 := json.Marshal(g)
if err1 != nil {
    return err1
} else if err2 != nil {
    return err2
} else if err3 != nil {
    return err3
} else if err4 != nil {
    return err4
} else if err5 != nil {
    return err5
} else if err5 != nil {
    return err5
} else if err6 != nil {
    return err6
}

This code's error handling is repetitive and verbose. To streamline it, we can use a function that takes a destination pointer and a source interface. This function will attempt to marshal the source to the destination and return an error if it fails. We can then use this function with all our sources and combine the errors into a single error. Here's how we can achieve this:

var err error
f := func(dest *D, src S) bool {
    *dest, err = json.Marshal(src)
    return err == nil
} // EDIT: removed ()

f(&aJson, a) &&
    f(&bJson, b) &&
    f(&cJson, c) &&
    f(&dJson, d) &&
    f(&eJson, e) &&
    f(&fJson, f) &&
    f(&gJson, g)
return err

This approach elegantly combines multiple errors into a single error variable. It simplifies error handling, improves code readability, and facilitates error handling within loops and other complex scenarios.

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