Switch Statements

Switch statements are not unconditionally bad, but a large or growing switch block is a warning sign of excessive code rigidity. To add new functionality via a switch statement, a developer must open the existing block, insert logic in the right place, and verify nothing else broke. Switch statements are inherently fragile because a single incorrect condition can silently alter the behavior of unrelated branches. Every modification to a large switch block risks inadvertently affecting other cases, propagating bugs in non-obvious ways. Switch statement blocks tend to grow rapidly as multiple developers add cases over time. Large switch blocks make bug identification and resolution a significant time investment. A switch block that developers must return to repeatedly in order to add new cases is a specific warning sign.