Some of the first few functions from: https://github.com/madrobby/zepto/blob/master/src/zepto.js

zepto-snippet-compiled-from-coffee.js

$.fn = {
  remove: function() {
    return this.each(function(el) {
      return el.parentNode.removeChild(el);
    });
  },
  each: function(callback) {
    this.dom.forEach(callback);
    return this;
  },
  filter: function(selector) {
    return $(this.dom.filter(function(element) {
      return $$(element.parentNode, selector).indexOf(element) >= 0;
    }));
  },
  pluck: function(property) {
    return this.dom.map(function(element) {
      return element[property];
    });
  }
};

zepto-snippet.coffee

$.fn =
  
  remove: ->
    @each (el) -> el.parentNode.removeChild el
  
  each: (callback) -> 
    @dom.forEach callback
    this
  
  filter: (selector) ->
    $ @dom.filter (element) ->
      $$(element.parentNode, selector).indexOf(element) >= 0
  
  pluck: (property) ->
    @dom.map (element) -> element[property]

zepto-snippet.js

$.fn = {

  remove: function() {
    return this.each(function(el){ el.parentNode.removeChild(el) });
  },
  
  each: function(callback) { 
    this.dom.forEach(callback); 
    return this; 
  },

  filter: function(selector) {
    return $(this.dom.filter(function(element){
      return $$(element.parentNode, selector).indexOf(element) >= 0;
    }));
  },
  
  pluck: function(property) { 
    return this.dom.map(function(element){ return element[property] });
  }

};