Visualizing if and else if: How JSVisualizer's Control Flow View Shows Which Branch Runs

A new tutorial in a series on classic algorithms uses JSVisualizer, a free browser tool, to explain how if, else if, and else conditionals execute. Its Control Flow view draws branches as a flowchart and highlights the paths a program actually takes, with counts showing how often each row ran. Using a grade-assigning example, the article shows that an else if is only checked when the preceding conditions are false, so exactly one branch runs. It then demonstrates that swapping condition order can make a branch unreachable, so the program can never produce an A.