Get Number Suffix (-st, -nd, -rd, -th)

getNumberSuffix.ts

export const getNUmberSuffix = (number: number): string => {
  const thExceptions = (number: number) =>
    [11, 12, 13].some((exception) => exception === number);
  const lastDigit = number % 10;

  if (thExceptions(number) || lastDigit === 0 || lastDigit > 3)
    return `${number}th`;
  if (lastDigit === 1) return `${number}st`;
  if (lastDigit === 2) return `${number}nd`;
  return `${number}rd`;
};

Log out to view:

const logOutNumber = new Array(31).fill(0).forEach((_,index) => console.log(getNumberSuffix(index + 1)))