How to replace null in an array?

Question

JavaScript

Good afternoon! Can you please tell me how to improve this?

const types = [
  null,
  null,
  'OPEN_MODAL',
  'CLOSE_MODAL',
];

that is, what can replace null? Doesn't look very good...
I want 'OPEN_MODAL' and 'CLOSE_MODAL' to be respectively where they are in the array.
Thank you!

Answer 1

const types = [];
types[2] = 'OPEN_MODAL';
types[3] = 'CLOSE_MODAL';

Answer 2

The very fact that 'OPEN_MODAL must necessarily be at array index 2, and CLOSE_MODAL - at 3 does not look very good.

Answer 3

see Null Object Pattern