Rewrite "if" into "switch"
The first two checks turn into two
case. The third check is split into two cases:
Please note: the
break at the bottom is not required. But we put it to make the code future-proof.
In the future, there is a chance that we’d want to add one more
case, for example
case 4. And if we forget to add a break before it, at the end of
case 3, there will be an error. So that’s a kind of self-insurance.
Rewrite the code below using a single