what is switch used for!?

Answer 1

I agree with @Mark. its substitute. you can use it for example for menu, check chooses or function with keypress, keyup, keydown.

Answer 2

Switch statements are just substitute for "if" statements.

Answer 3

can be used as an alternative for the if else if else statements

Answer 4

switch are same as if else statements but are faster

Answer 5

It is more convenient to use cycle