rwc-iq-09-25-22

/**
 * Write a function to output the ordinal suffix of a positive integer 
 * concatenated to an inputted number.
 * 
 * > ordinal(3)
> '3rd'

> ordinal(57)
> '57th'
 */

const ordinal = (num) => {
  if (!num) return 'cannot give an ordinal to nothing';
  num = num.toString();
  let numArray = [...num];
  let lastDigit = numArray[numArray.length - 1];
  
  switch (true) {
    case num == '11' ||
      num == '12' ||
      num == '13' ||
      lastDigit == '4' ||
      lastDigit == '5' ||
      lastDigit == '6' ||
      lastDigit == '7' ||
      lastDigit == '8' ||
      lastDigit == '9' ||
      lastDigit == '0':
      return `${num}th`;
      break;
    case lastDigit == '1':
      return `${num}st`;
      break;
    case lastDigit == '2':
      return `${num}nd`;
      break;
    case lastDigit == '3':
      return `${num}rd`;
      break;
  } 
};