How Can I Eleganly Handle Multiple Errors in Go's JSON Marshaling?

Error Handling Made Elegant in Go

In Go, it can be challenging to handle multiple errors efficiently. Consider the following code:

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 features extensive error checking, but its handling approach is unwieldy. Is there a more elegant way to manage these errors?

Fortunately, there is. By leveraging the power of closures and a shared error variable, we can achieve concise error handling:

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

In this updated code, we define a closure f that handles the JSON marshalling and error checking for a given source and destination. By using the && operator to chain these calls, we can execute them consecutively, and the first error encountered will be captured in the shared err variable. This allows us to handle all errors at once, significantly improving the code's readability and maintainability.

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