Get ordinal numbers in JavaScript

get-ordinal-number.js

const getOrdinalNumber = number => {
  const ordinalNumbers = [
    "first",
    "second",
    "third",
    "fourth",
    "fifth",
    "sixth",
    "seventh",
    "eigth",
    "ninth",
    "tenth",
    "eleventh",
    "twelfth"
  ];

  if (ordinalNumbers[number - 1]) return ordinalNumbers[number - 1];
  if (number.toString().slice(-1) === "1") return `${number}st`;
  if (number.toString().slice(-1) === "2") return `${number}nd`;
  if (number.toString().slice(-1) === "3") return `${number}rd`;
  return `${number}th`;
};