How can I use ranges in a switch case statement using JavaScript?
You have at least four options:
1. List each case
As shown by LightStyle, you can list each case explicitly:
switch(myInterval){
case 0:
case 1:
case 2:
doStuffWithFirstRange();
break;
case 3:
case 4:
case 5:
doStuffWithSecondRange();
break;
case 6:
case 7:
doStuffWithThirdRange();
break;
default:
doStuffWithAllOthers();
}
2. Use if
/ else if
/ else
If the ranges are large, that gets unwieldy, so you'd want to do ranges. Note that with if...else if...else if
, you don't get to the later ones if an earlier one matches, so you only have to specify the upper bound each time. I'll include the lower bound in /*...*/
for clarity, but normally you would leave it off to avoid introducing a maintenance issue (if you include both boundaries, it's easy to change one and forget to change the other):
if (myInterval < 0) {
// I'm guessing this is an error
}
else if (/* myInterval >= 0 && */ myInterval <= 2){
doStuffWithFirstRange();
}
else if (/* myInterval >= 3 && */ myInterval <= 5) {
doStuffWithSecondRange();
}
else if (/* myInterval >= 6 && */ myInterval <= 7) {
doStuffWithThirdRange();
}
else {
doStuffWithAllOthers();
}
3. Use case
with expressions:
JavaScript is unusual in that you can use expressions in the case
statement, so we can write the if...else if...else if
sequence above as a switch
statement:
switch (true){
case myInterval < 0:
// I'm guessing this is an error
break;
case /* myInterval >= 0 && */ myInterval <= 2:
doStuffWithFirstRange();
break;
case /* myInterval >= 3 && */ myInterval <= 5:
doStuffWithSecondRange();
break;
case /* myInterval >= 6 && */ myInterval <= 7:
doStuffWithThirdRange();
break;
default:
doStuffWithAllOthers();
}
I'm not advocating that, but it is an option in JavaScript, and there are times it's useful. The case
statements are checked in order against the value you give in the switch
. (And again, lower bounds could be omitted in many cases because they would have matched earlier.) Even though the case
s are processed in source-code order, the default
can appear anywhere (not just at the end) and is only processed if either no case
s matched or a case
matched and fell through to the default (didn't have a break
; it's rare you want to do that, but it happens).
4. Use a dispatch map
If your functions all take the same arguments (and that could be no arguments, or just the same ones), another approach is a dispatch map:
In some setup code:
var dispatcher = {
0: doStuffWithFirstRange,
1: doStuffWithFirstRange,
2: doStuffWithFirstRange,
3: doStuffWithSecondRange,
4: doStuffWithSecondRange,
5: doStuffWithSecondRange,
6: doStuffWithThirdRange,
7: doStuffWithThirdRange
};
Then instead of the switch:
(dispatcher[myInterval] || doStuffWithAllOthers)();
That works by looking up the function to call on the dispatcher
map, defaulting to doStuffWithAllOthers
if there's no entry for that specific myInterval
value using the curiously-powerful ||
operator, and then calling it.
You can break that into two lines to make it a bit clearer:
var f = dispatcher[myInterval] || doStuffWithAllOthers;
f();
I've used an object for maximum flexibility. You could define dispatcher
like this with your specific example:
var dispatcher = [
/* 0-2 */
doStuffWithFirstRange,
doStuffWithFirstRange,
doStuffWithFirstRange,
/* 3-5 */
doStuffWithSecondRange,
doStuffWithSecondRange,
doStuffWithSecondRange,
/* 6-7 */
doStuffWithThirdRange,
doStuffWithThirdRange
];
...but if the values aren't contiguous numbers, it's much clearer to use an object instead.
Switch case with range
This should work.
private func calculateUserScore() -> Int {
let diff = abs(randomNumber - Int(bullsEyeSlider.value))
switch diff {
case 0:
return PointsAward.bullseye.rawValue
case 1..<10:
return PointsAward.almostBullseye.rawValue
case 10..<30:
return PointsAward.close.rawValue
default:
return 0
}
}
It's there in the The Swift Programming Language book under Control Flow -> Interval Matching.
Using switch statement with a range of value in each case?
Java has nothing of that sort. Why not just do the following?
public static boolean isBetween(int x, int lower, int upper) {
return lower <= x && x <= upper;
}
if (isBetween(num, 1, 5)) {
System.out.println("testing case 1 to 5");
} else if (isBetween(num, 6, 10)) {
System.out.println("testing case 6 to 10");
}
How do I select a range of values in a switch statement?
In C++ case labels are constant expressions, not expressions in general. You need a chain of if-then-else statements to do what you are trying to do.
Alternatively, you can enumerate the values in the switch. This runs marginally faster (though it does not matter in cases like yours), but it is considerably less readable:
switch(score) {
case 0: cout << "f"; break;
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10: cout << "e"; break;
case 11:
case 12:
case 13:
case 14:
case 15:
case 16:
case 17:
case 18:
case 19:
case 20:
case 21:
case 22:
case 23:
case 24:
case 25: cout << "c"; break;
// ...and so on, you get the idea...
}
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