Dart type info at runtime

type_runtime.dart

void main() { 
  const sampleMap = <String, dynamic>{
   'key': 'value',
   'anotherKey': 6220119,
  };
  print(sampleMap is Map);
  // [output]: true
  print(sampleMap is Map<dynamic, dynamic>);
  // [output]: true
  print(sampleMap is Map<String, dynamic>);
  // [output]: true
  
  
  const anotherMap = <dynamic, dynamic>{
    'key': 'value',
    'anotherKey': 6220120,
  };
  print(anotherMap is Map);
  // [output]: true
  print(anotherMap is Map<dynamic, dynamic>);
  // [output]: true
  print(anotherMap is Map<String, dynamic>);
  // [output]: false
  
  try {
    print(anotherMap as Map<String, dynamic>);
  } catch (error) {
    print(error);
  }
  // [output]: TypeError: 
  // Instance of 'ConstantStringMap<dynamic, dynamic>': 
  // type 'ConstantStringMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>'
}