setNestedValue method

void setNestedValue(
  1. List keyPath,
  2. dynamic value
)

Sets a value in a nested map structure, creating intermediate maps as needed.

Traverses the keyPath in the map, creating empty maps for any missing intermediate keys, and sets the value at the final key in the path.

Example:

final map = <String, dynamic>{};
map.setNestedValue(['hello', 'world'], 'oh hey there!');
print(map); // {hello: {world: oh hey there!}}

Implementation

void setNestedValue(List<dynamic> keyPath, dynamic value) {
  var currentLevel = this;
  for (var n = 0; n < keyPath.length - 1; n++) {
    final key = keyPath[n];
    final nextLevel = currentLevel[key];
    if (nextLevel is Map<dynamic, dynamic>) {
      currentLevel = nextLevel;
    } else {
      final newMap = <dynamic, dynamic>{};
      currentLevel[key] = newMap;
      currentLevel = newMap;
    }
  }
  currentLevel[keyPath.last] = value;
}