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package main
type Dictionary map[string]string
type DictionaryError string
var (
ErrorNotFound = DictionaryError("could not find the word you were looking for")
ErrorWordDoesNotExist = DictionaryError("cannot update word because it does not exist")
ErrorWordExists = DictionaryError("cannot add word because it already exists")
)
func (e DictionaryError) Error() string {
return string(e)
}
func (d Dictionary) Search(word string) (string, error) {
definition, ok := d[word]
if !ok {
return "", ErrorNotFound
}
return definition, nil
}
func (d Dictionary) Add(word, definition string) error {
_, err := d.Search(word)
switch err {
case ErrorNotFound:
d[word] = definition
return nil
case nil:
return ErrorWordExists
default:
return err
}
}
func (d Dictionary) Update(word, definition string) error {
_, err := d.Search(word)
switch err {
case ErrorNotFound:
return ErrorWordDoesNotExist
case nil:
d[word] = definition
return nil
default:
return err
}
}
func (d Dictionary) Delete(word string) {
delete(d, word)
}
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