adding another contract in current contract using aray is it complusory to push variable of array

[AAKASH-MUNDLIA]

adding another contract in current contract using aray is it complusory to push variable of array
here my code ;
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./first.sol";
contract Storage{
lucky[] public nonlucky;
function cstorage() public{
lucky note = new lucky();
nonlucky.push(note);
}
}
is it complusory to add "note" if yes then why? =>>>>>> nonlucky.push(note);

[krakxn]

Yes, if you need those note instances which are pushed to nonlucky array. If not, no.

[AAKASH-MUNDLIA]

from solidity:
Warning: Unused local variable.
--> storage.sol:7:8:
|
7 | lucky note = new lucky();
| ^^^^^^^^^^^

i removed note then showed me this error

[krakxn]

Because you are not using it anywhere—and as it will be just a wastage of gas—Remix prevents it compile-time.

Removing it should fix the problem.