requireDouble method

double? requireDouble(
  1. String key
)

Required number as double; an int is widened. Records an error and returns null when the value is absent or not a number. Audited: 2026-06-12 11:26 EDT

Implementation

double? requireDouble(String key) {
  final Object? v = _map[key];
  if (v is num) return v.toDouble();
  _typeError(key, v, 'double');
  return null;
}