function getMonthName(monthNumber) {
  const date = new Date();
  date.setMonth(monthNumber - 1);

  return date.toLocaleString([], { month: 'long' });
}

The current day of month will have an impact on the behavior of this method. Conceptually it will add the number of days given by the current day of the month to the 1st day of the new month specified as the parameter, to return the new date. For example, if the current value is 31st January 2016, calling setMonth with a value of 1 will return 2nd March 2016. This is because in 2016 February had 29 days.

  • ricecake@sh.itjust.works
    1·
    1 year ago

    So, you’re talking about throwing exceptions if adding a month yields an invalid date if done without nuance, but then you’re showing an example of just trying to instantiate an invalid date in java.

    I believe java has an addMonths method, that in the situation we’re talking about doesn’t throw an exception, but rather limits the output to the 28th/ 29th/30th.

    Which illustrates my point: intuitive Datetime math involves choosing how you handle edge cases that are routine and not exceptional, like “a month from January 31st”.

    The rest of your comment arguing about how people expect months to work just makes me feel like you’ve never actually talked to a business stakeholder about requirements.

    If I say to add four days, will it throw an exception if it’s the 31st? No month has 35 days, so I should get an exception, right?

    Yeah, it’s how months work.

    That’s just insane. An API that doesn’t increment the month when you pass the end while adding days is just broken.

    • ☆ Yσɠƚԋσʂ ☆@lemmy.mlOP
      39·
      1 year ago

      I encourage you to actually try using Java API to see how it works if you don’t think my example is illustrative enough. Meanwhile, the only insane thing here is you thinking that how an API works has anything to do with business stakeholders and requirements. This statement clearly illustrates that you don’t understand how to translate business requirements into code and perhaps should spend some time learning how to do that instead of trolling here.