How to get the day of the week from the day number in JavaScript?

Question

Given dayNumber is from 0 - 6 representing Monday - Sunday respectively.

Can the Date /

Answer 1

/**
* I convert a day string to an number.
*
* @method dayOfWeekAsInteger
* @param {String} day
* @return {Number} Returns day as number
*/
function dayOfWeekAsInteger(day) {
  return ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"].indexOf(day);
}