Function unionWith

unionWith<V>(
combiner: (left: V) => (right: V) => V,
): <K>(left: Map<K, V>) => (right: Map<K, V>) => Map<K, V>
Combines two Maps into another one. If there are duplicate keys, their value will be merged with combiner.
Type Parameters
- V
Parameters
- combiner: (left: V) => (right: V) => V
  Function to merge left and right values where entries have duplicate key.
Returns <K>(left: Map<K, V>) => (right: Map<K, V>) => Map<K, V>
A new Map with entries came from both of them.
- Defined in src/map.ts:527