Example for my iDDD with Go blog article series at https://medium.com/@TonyBologni

assertMatchingConfirmationHash.go

package customer

import (
    "github.com/AntonStoeckl/go-iddd/service/customeraccounts/application/domain/customer/value"
    "github.com/AntonStoeckl/go-iddd/service/shared"
    "github.com/cockroachdb/errors"
)

func assertMatchingConfirmationHash(current value.ConfirmationHash, supplied value.ConfirmationHash) error {
    if !current.Equals(supplied) {
        return errors.Mark(errors.New("wrong confirmation hash supplied"), shared.ErrDomainConstraintsViolation)
    }

    return nil
}