A JavaScript function for converting number to ordinal.

ConvertToOrdinal.js

function getOrdinal(number) {
  if (typeof number !== 'number' || isNaN(number)) {
    throw new Error('Input must be a valid number');
  }

  const suffixes = ['th', 'st', 'nd', 'rd'];
  const remainder = number % 100;
  const suffix = suffixes[(remainder - 20) % 10] || suffixes[remainder] || suffixes[0];

  return number + suffix;
}

// Examples:
console.log(getOrdinal(1)); // Output: 1st
console.log(getOrdinal(22)); // Output: 22nd
console.log(getOrdinal(123)); // Output: 123rd