Function alter

alter<V>(
updater: (oldEntry: Option.Option<V>) => Option.Option<V>,
): <K>(key: K) => (m: Map<K, V>) => Map<K, V>
Alters entry with the key. This lets you insert, modify and remove an entry.
Type Parameters
- V
Parameters
- updater: (oldEntry: Option.Option<V>) => Option.Option<V>
  Function to make a new value from the old one. If the entry was not found, oldEntry will be None. When this returned None, the entry will be removed.
Returns <K>(key: K) => (m: Map<K, V>) => Map<K, V>
A new Map with the replaced entry.
- Defined in src/map.ts:478