forget static method

Map forget(Map map, String key)

Removes key (dot notation) from map. Returns the map for chaining.

When the leaf lives inside a List, the element is removed via removeAt, shifting subsequent indices.

Implementation

static Map forget(Map map, String key) {
  if (key.isEmpty) return map;
  if (map.containsKey(key)) {
    map.remove(key);
    return map;
  }
  final segments = key.split('.');
  dynamic current = map;
  for (var i = 0; i < segments.length - 1; i++) {
    final s = segments[i];
    if (current is Map) {
      final next = current[s];
      if (next is Map || next is List) {
        current = next;
      } else {
        return map;
      }
    } else if (current is List) {
      final idx = int.tryParse(s);
      if (idx == null || idx < 0 || idx >= current.length) return map;
      current = current[idx];
    } else {
      return map;
    }
  }
  final last = segments.last;
  if (current is Map) {
    current.remove(last);
  } else if (current is List) {
    final idx = int.tryParse(last);
    if (idx != null && idx >= 0 && idx < current.length) {
      current.removeAt(idx);
    }
  }
  return map;
}