errset is a trivial golang package that implements a slice of errors.
The typical go idiom is to return an error or a tuple of (thing, error) from functions. This works well if a function performs exactly one task, but
when a function does work which can reasonably partially fail, I found myself writing the same code over and over again. For example:
// CommitBatch commits as many things as it can.
func CommitBatch(things []Thing) error {
errs := errset.ErrSet{}
for _, thing := range things {
err := Commit(thing)
if err != nil {
errs = append(errs, err)
}
}
return errs.ReturnValue() // nil if there were no errors
}