const myMap = Map.of(
  'one', 1,
  'two', 2,
  'three', 3
);
const myKeyedSeq = myMap.toSeq();

console.log('myKeyedSeq', myKeyedSeq.toJS());
// -> myKeyedSeq { one: 1, two: 2, three: 3 }

These examples aim to illustrate that sequences are simply a representation of the original collection. It's not often that you'll store sequences in constants like this. In fact, there are several places in this book where we store constants unnecessarily. This is done simply as an effort to make the code more teachable.