■ How to change the length of Array
Push | Pop push(): constant gas costs cuz storage is zero-initialized [1,2, ] ⤴︎
pop(): dynamic gas cost because it depends on the “size” of the element
[1,2,3] ⤵︎ push and pop is the only way to change the length of an array
https://docs.soliditylang.org/en/v0.8.13/types.html?highlight=pop#array-members