advantage of switch case over if else code example

Example 1: ADVANTAGES OF SWITCH CASE OVER IF ELSE?

Check the Testing Expression: An if-then-else statement can test expressions 
	based on ranges of values or conditions, whereas a switch statement tests
    expressions based only on a single integer, enumerated value, or String
    object.
Switch better for Multi way branching: When compiler compiles a switch statement
	, it will inspect each of the case constants and create a “jump table” that 
    it will use for selecting the path of execution depending on the value of 
    the expression. Therefore, if we need to select among a large group of 
    values, a switch statement will run much faster than the equivalent logic
    coded using a sequence of if-elses. The compiler can do this because it 
    knows that the case constants are all the same type and simply must be 
    compared for equality with the switch expression, while in case of if 
    expressions, the compiler has no such knowledge.
if-else better for boolean values: If-else conditional branches are great for 
	variable conditions that result into a boolean, whereas switch statements 
    are great for fixed data values.
Speed: A switch statement might prove to be faster than ifs provided number 
	of cases are good. If there are only few cases, it might not effect the
    speed in any case. Prefer switch if the number of cases are more than 5 
    otherwise, you may use if-else too.
If a switch contains more than five items, it’s implemented using a lookup 
	table or a hash list. This means that all items get the same access time,
	compared to a list of if:s where the last item takes much more time to 
    reach as it has to evaluate every previous condition first.
Clarity in readability: A switch looks much cleaner when you have to combine 
	cases. Ifs  are quite vulnerable to errors too. Missing an else statement 
    can land you up in havoc. Adding/removing labels is also easier with a 
    switch and makes your code significantly easier to change and maintain.

Example 2: if else or switch case which is faster

the switch statement is faster in most cases when compared to if-else , but significantly faster only when the number of conditions is large. The primary difference in performance between the two is that the incremental cost of an additional condition is larger for if-else than it is for switch .