merge method
Merges this map with another other
map. For duplicate keys, resolve
determines the final value.
Example:
var map1 = {'first': 1, 'second': 2};
var map2 = {'second': 3, 'third': 4};
print(map1.merge(map2, (v1, v2) => v1 + v2)); // Output: {'first': 1, 'second': 5, 'third': 4}
Implementation
Map<K, V> merge(Map<K, V> other, V Function(V v1, V v2)? resolve) {
final Map<K, V> result = Map<K, V>.from(this);
other.forEach((key, value) {
if (result.containsKey(key) && resolve != null) {
result[key] = resolve.call(result[key] as V, value);
} else {
result[key] = value;
}
});
return result;
}