React-calendar: How to use formatMonthYear or formatShortWeekday these functions?

[akhilaudable]

I tried a lot about how to use formatMonthYear, formatShortWeekday? But couldn't write code properly. I need to use the single letter week names. Please need help

        formatShortWeekday = () => {
          value => ['S', 'M', 'T', 'W', 'T', 'F', 'S'][value.getDay()]
        }


         render() {
          return (
            <CalendarInput
              value='' // Need to implement
              returnValue="range"
              calendarType="US"
              className={classes.calendar}
              onChange={() => {
                // Need to implement
              }}
              formatShortWeekday={this.formatShortWeekday}
            />
          );
         }

Getting errors, I believe there is some syntax mistake.
I followed this issue https://github.com/wojtekmaj/react-calendar/issues/34 but not cleared how to use any of these formatDate functions.
Please help.

[wojtekmaj]

As documentation states, formatShortWeekday gets two arguments: locale, date. You need to .getDay() on date that is given as an argument, and it should work just fine.

  formatShortWeekday = (locale, date) => ['S', 'M', 'T', 'W', 'T', 'F', 'S'][date.getDay()]

[freshlySqueezedBananas]

And how do you do it locale-dependent? I'm trying to use the exact example from the documentation
(locale, date) => formatDate(date, 'dd')

but I keep getting the following error:
Calendar.js:94 Uncaught TypeError: Object(...) is not a function