splice(): change the array itself

Useful to know

splice() removes, replaces or adds items in place. If const items = [1, 2, 3]; and execute items.splice(1, 1, 9), items becomes [1, 9, 3], and the returned value is [2]. [1]

Distinguish the changed list from the call result. It is a common mistake to save the removed items as the "new complete list". If the goal is only to read some of the data , slice is more appropriate. Before deleting by found index check also the case -1 from a failed search.