trimDeep function

Object? trimDeep(Object? value)

Trims all strings in the value, in nested maps and lists too. Returns the value itself when there is nothing to trim, and a trimmed copy otherwise: the value is never changed.

Implementation

Object? trimDeep(Object? value) {
  if (value is String) return value.trim();

  if (value is Map<Object?, Object?>) {
    Map<Object?, Object?>? copy;
    value.forEach((key, item) {
      final trimmed = trimDeep(item);
      if (!identical(trimmed, item)) (copy ??= Map.of(value))[key] = trimmed;
    });
    return copy ?? value;
  }

  if (value is List<Object?>) {
    List<Object?>? copy;
    for (var i = 0; i < value.length; i++) {
      final item = value[i];
      final trimmed = trimDeep(item);
      if (!identical(trimmed, item)) (copy ??= List.of(value))[i] = trimmed;
    }
    return copy ?? value;
  }

  return value;
}