extractMap method

Option<Map<K, dynamic>> extractMap(
  1. K key
)

Return an Option that conditionally accesses map keys, if they contain a map with the same key type.

Useful for accessing nested JSON.

{ 'test': { 'foo': 'bar' } }.extractMap('test'); /// `Some({ 'foo': 'bar' })`
{ 'test': 'string' }.extractMap('test'); /// `None()`

Implementation

Option<Map<K, dynamic>> extractMap(K key) => extract<Map<K, dynamic>>(key);