Function getKey

getKey<K, V>(
    map?: Map<K, V> | ReadonlyMap<K, V>,
    value?: V,
    defaultKey?: K,
): undefined | K
Returns the key with the given value
Type Parameters
- K
- V
Parameters
- Optionalmap: Map<K, V> | ReadonlyMap<K, V>
  the map to inspect
- Optionalvalue: V
  the value to lookup
- OptionaldefaultKey: K
  the default key when nothing matches the given value
Returns undefined | K
the key with the given value

Author
David Hsing