Detect months with 31 days

Question

Is there an analogous form of the following code:

if(month == 4,6,9,11)
{
  do something;
}

Or must it be:

if(month == 4 ||         


        

Answer 1

You don't specify the language, but if you're using Java then yes, you have do do it the second way, or otherwise use switch:

switch(month) {
  case 4:
  case 6:
  case 9:
  case 11:
    do something;
}

Alternatively, you might find it useful and cleaner (depending on the design) to not hard-code the values but keep them elsewhere:

private static final Collection MONTHS_TO_RUN_REPORT = Arrays.asList(4, 6, 9, 11);
....
if (MONTHS_TO_RUN_REPORT.contains(month)) {
  do something;
}