A chain of if
/elsif
statements is evaluated from top to bottom.
At most, only one branch will be executed: the first one with a condition that evaluates to true
.
Therefore, duplicating a condition automatically leads to dead code. Usually, this is due to a copy/paste error. At best, it's simply dead code and at worst, it's a bug that is likely to induce further bugs as the code is maintained, and obviously it could lead to unexpected behavior.
IF (param = 1) THEN open(); ELSIF (param = 2) THEN close(); ELSIF (param = 1) THEN // Incorrect move(); END IF;