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

This code is a modified version of what is given above. It returns the string representing the day instead

/**
* Converts a day number to a string.
*
* @param {Number} dayIndex
* @return {String} Returns day as string
*/
function dayOfWeekAsString(dayIndex) {
  return ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"][dayIndex] || '';
}

For example

dayOfWeekAsString(0) returns "Monday"