In VBScript I can use a Select Case statement like that:
Select Case X
Case 1 to 10 'X is between 1 and 10
Case 11,14,16 'X is 11 or 14 or 16
End Select
JavaScript's syntax is based on that of C, and as in C,
there is no syntactic sugar for switch statements. However,
as in C, omitting the "break;" after a switch case will cause
execution to fall through to the following case. (Opinion is
divided on whether this is a good thing.)
switch (x) {
case 1:
case 2:
case 3:
/* ... */
case 10:
// execute some code for this case
break;
case 11:
case 14:
case 16:
// execute some other code for this thing
break;
default:
// complain
break; // for uniformity
}
In my opinion it is good practice to mark with LOUD COMMENTS
places where you use this "fall-through" feature -- except for
code like the example above, where it's fairly obvious from the
long string of "case n:" without any intervening code.
switch (x) {
case 1:
// some stuff that has to happen in case 1
/* *** FALL THROUGH *** */
case 2:
// some stuff that has to happen either for 1 or 2
break;
}
In a case such as the VB example you gave above, a chained if-else
might in fact be clearer and less verbose:
if (1 <= x && x <= 10) {
// do some stuff
} else if (x == 11 || x == 14 || x == 16) {
// do some other stuff
} else {
// complain
}
