text: 
  const map= ( object, callback, context=undefined, )=> Object.fromEntries(
  	Object.entries( object, ).map(
  		( [ key, value, ], )=> [ key, callback.call( context, value, key, object, ), ],
  	)
  );
  
  Reflect.defineProperty( Object, 'map', { value: map, }, );
  