Function alter

alter<V>(updater): (<K>(key) => ((m) => Map<K, V>))
Alters entry with the key. This lets you insert, modify and remove an entry.
Type Parameters
- V
Parameters
- updater: ((oldEntry) => 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.
  - - (oldEntry): Option<V>
    - Parameters
      oldEntry: Option<V>
      Returns Option<V>
Returns (<K>(key) => ((m) => Map<K, V>))
A new Map with the replaced entry.
- - <K>(key): ((m) => Map<K, V>)
  - Type Parameters
    - K
    Parameters
    - key: K
    Returns ((m) => Map<K, V>)
    - - (m): Map<K, V>
      - Parameters
        m: Map<K, V>
        Returns Map<K, V>
- Defined in src/map.ts:474

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