Jóladagatal 2/24 - Jólakveðja

santa-said-merry-christmas.js

/**
 * Circulate santas saying merry christmas to each other
 * @param  int    Numer of santas
 * @return String
 */
function santaSaidMerryChristmas(n) {

  // vars
  var santas = Array.apply(null, Array(n)).map(function (_, i) { return (i + 1); }),
      i = 0;

  // while two santas are available
  while (santas.length > 1) {

    // reset cursor if last sant
    i = (i >= santas.length) ? 0 : i;

    // splice the next santa out
    santas.splice(((i + 1) >= santas.length) ? 0 : (i + 1), 1);

    // move cursor
    i++
  }

  // pop last santa
  return 'Santa ' + santas.pop() + ' was left in the circle';
}