gistfile1.txt

  jwerty.key('←', function () {
      // Check if we are on the first slide, if so, do not execute
      if (!$('.introSlide').is(":visible")) {
        prevSlide();
        buttonToggle();
      };
  });
  
  $('#prevSlide').click(function() {
    // Check if we are on the first slide, if so, do not execute
    if (!$('.introSlide').is(":visible")) {
      prevSlide();
      buttonToggle();
    };
  });

  jwerty.key('←', showNext);
  $('#prevSlide').click(showNext);

function showNext(){
    // Check if we are on the first slide, if so, do not execute
    if (!$('.introSlide').is(":visible")) {
      prevSlide();
      buttonToggle();
    }
}

So we can remove the anonymous functions say eising

Example:

jwerty.key('↑', function () {
  resetSlides();
});

$('.resetSlides').click(function() {
  resetSlides();
});

How?

(NM you were faster :))

jwerty.key('↑', function () {
  resetSlides();
});

$('.resetSlides').click(function() {
  resetSlides();
});

Could be just…

jwerty.key('↑', resetSlides);

$('.resetSlides').click(resetSlides);

But actually you don’t need a named function at all:

var $resetSlides = $('.resetSlides');

$resetSlides.click(function() {
  // teh coads
});

jwerty.key('↑', $resetSlides.click); // i.e. just trigger a `click` event on `$resetSlides`

Hmm yeah, that makes sense. Your 2nd code block is more readable and I can keep all my functions apart so went for that. The 3rd code block is more 1337 I guess ;)