unconditionalSayIt.js

/*
  sayIt accepts an unlimited number of chaining calls, each passing a word. When it's finally called 
  without arguments, all the passed words are printed in order
  
  sayIt('have')('you')('got')('any')('fish')('fingers?')(); ->
  "have you got any fish fingers?"
  
  A regular implementaion would go sthg like this

  function sayIt(firstWord) {
    var words = [];
    return (function reallySayIt(word) {
      if (word) {
        words.push(word);
        return reallySayIt;
      } else {
        return words.join(' ');
      }
    })(firstWord);
  }  
  
  During a bout of insomnia last night, I wondered if I could write it without any conditionals. 
  Here's what I got.
  WARNING: IT'S MAD
*/  

var sayIt = function(word) {
  var words = Array.prototype;
  words.push(word);
  sayIt.toString = function() {
    try {return words.join(' ')} finally {words.splice(0, words.length);}
  }
  return sayIt;
}

Bind All The Things

var sayIt = function(word){
  this.push(word);
  sayIt.toString = function () {
    return this.splice(0, this.length).join(' ');
  }.bind(this);
  return sayIt;
}.bind([]);

function sayIt() {
  var words = [].slice.call(arguments, 0).join(" ")
  try { words.length > arguments[0].length && arguments[1].length }
  catch (e) { return words }
  return function(word) {
    return sayIt.call(null, words, word)
  }
}