1 – 8 = -7 9 – 15 = -6 16 – 100 = -84 You have: case -7: … break; case -6: … break; case -84: … break; Either use: case 1: case 2: case 3: etc, or (perhaps more readable) use: if(age >= 1 && age <= 8) { … } else if … Read more
A switch is often compiled to a jump-table (one comparison to find out which code to run), or if that is not possible, the compiler may still reorder the comparisons, so as to perform a binary search among the values (log N comparisons). An if-else chain is a linear search (although, I suppose, if all … Read more
Mysql supports two variants of case, the one you use in query 2 is less flexible but supports only equality on a single variable. The other version specifies no variable after case and then conditions need not be only equality: select id_tag, case when tag LIKE “%class%” then “class” when tag LIKE “%new%” then “new” … Read more
The CASE is just a “switch” to return a value – not to execute a whole code block. You need to change your code to something like this: SELECT @selectoneCount = CASE @Temp WHEN 1 THEN @selectoneCount + 1 WHEN 2 THEN @selectoneCount + 1 END If @temp is set to none of those values … Read more
some alternative: /* curly braces inside the case */ const i = 1 switch (i) { case 0: { let x = 2342; let s = 1 + x; console.log(x+’ & ‘+s+’ from inside’); } break; case 1: { let x = 2342; let s=”b”; console.log(x+’ & ‘+s+’ from inside’); /* 2342 & b from … Read more
This is a technique used by the JavaScript engine called hoisting. The parser will read through the entire function before running it, and any variable declarations (i.e. using the var keyword) will be executed as if they were at the top of the containing scope. So your code behaves like: var country; var i; country … Read more
There is no clean way to solve this with switch, as cases need to be integral types. Have a look at if-else if-else.
Since the compiler knows what type of enum you’re evaluating in the switch statement, you should drop the “qualified” portion as the error suggests (in your case: MyEnum.UserType.) and simply use the “unqualified” enum DOCTORS. See below: switch(myEnum.getUserType()) { case DOCTORS: break; }
A switch construct is faster (or at least not slower). That’s mostly because a switch construct gives static data to the compiler, while a runtime structure like a hash map doesn’t. When possible compilers should compile switch constructs into array of code pointers: each item of the array (indexed by your indexes) points to the … Read more
The break statement inside a switch can be used when you don’t need a case to have any actual functionality, but want to include it to make your logic easier or clearer. Suppose for example you want to use a switch statement to determine if a given year is a leap year or not. (This … Read more