COMPLEX Function

COMPLEX.js

// Copyright (c) 2012 Sutoiku, Inc. (MIT License)

function COMPLEX(real, imaginary, suffix) {
  // Return error if either number is a non-numeric value
  if (isNaN(real) || isNaN(imaginary)) return '#VALUE!';

  // Set suffix
  var suffix = (typeof suffix === 'undefined') ? 'i' : suffix;

  // Return error if suffix is neither "i" nor "j"
  if (suffix !== 'i' && suffix !== 'j') return '#VALUE!';

  // Return complex number
  if (real === 0 && imaginary === 0) {
    return 0;
  } else if (real === 0) {
    return (imaginary === 1) ? suffix : imaginary.toString() + suffix;
  } else if (imaginary === 0) {
    return real.toString();
  } else {
    var sign = (imaginary > 0) ? '+' : '';
    return real.toString() + sign + ((imaginary === 1) ? suffix : imaginary.toString() + suffix);
  }
}