unflattenKeys method

  1. @useResult
Map<String, dynamic> unflattenKeys()

Unflattens dot-separated keys into nested maps.

Implementation

@useResult
Map<String, dynamic> unflattenKeys() {
  final Map<String, dynamic> out = <String, dynamic>{};
  for (final MapEntry<String, dynamic> e in entries) {
    final List<String> parts = e.key.split('.');
    Map<String, dynamic> parentMap = out;
    for (int i = 0; i < parts.length - 1; i++) {
      final String part = parts[i];
      final childMap = parentMap.putIfAbsent(part, () => <String, dynamic>{});
      if (childMap is Map<String, dynamic>) parentMap = childMap;
    }
    final lastPart = parts.lastOrNull;
    if (lastPart != null) parentMap[lastPart] = e.value;
  }
  return out;
}