nowhereman/Object_tap.html

## Object_tap.html
<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Object#tap in JavaScript</title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
    <script type="text/javascript" src="http://sugarjs.com/javascripts/sugar-0.9.5.min.js"></script>
    <script type="text/javascript">
      jQuery.noConflict();
      (function($) {
        $(function(){

            // Object#tap method
            if(!Object.prototype.tap) { // if this method does not exist..
                Object.prototype.tap = function(name) {
                    //console.debug(typeof(name));//debug
                    if(typeof(name) == "function") {
                        name.apply(this);
                    } else {
                        var args = Array.prototype.slice.call(arguments);
                        this[name].apply(this, args.slice(1));
                    }
                    return this;
                };
            }

            // Fails
            //var withoutTap = [1, 2, 3, 4, 5].pop().map(function (n) { return n * 2 });
            //console.debug(withoutTap);//debug

            // Pass
            //var tapTest = [1, 2, 3, 4, 5].tap.pop.map { |n| n * 2 };
            var withTap = [1, 2, 3, 4, 5].tap(function() { this.pop(); }).map(function (n) { return n * 2 });
            //console.debug(withTap);//debug
            $("#test-panel").append("Test1: " + withTap.toString() + "<br />");

            var withTap2 = [1, 2, 3, 4, 5].tap("pop").map(function (n) { return n * 2 });
            //console.debug(withTap2);//debug
            $("#test-panel").append("Test2: " + withTap2.toString() + "<br />");

            var withTap3 = [1, 2].tap(function() { this.push(3, 4); }).map(function (n) { return n * 2 });
            //console.debug(withTap3);//debug
            $("#test-panel").append("Test3: " + withTap3.toString() + "<br />");

            var withTap4 = [1, 2].tap("push", 3, 4).map(function (n) { return n * 2 });
            //console.debug(withTap4);//debug
            $("#test-panel").append("Test4: " + withTap4.toString() + "<br />");

            var withTap5 = [1, 2, 3].tap(function() { if(this.none(4)) this.add(4); }).map(function (n) { return n * 2 });
            //console.debug(withTap5);//debug
            $("#test-panel").append("Test5: " + withTap5.toString() + "<br />");

            var withTap6 = [1, 2, 3, 4].tap(function() { if(this.last() === 5) this.pop(); }).map(function (n) { return n * 2 });
            //console.debug(withTap6);//debug
            $("#test-panel").append("Test6: " + withTap6.toString() + "<br />");

        });
      })(jQuery);
    </script>
  </head>
  <body>
    <h2>Object#tap in JavaScript</h2>
    <p>
      With the help of <a href="http://sugarjs.com">Sugar JavaScript lib</a>.<br />
      Based on a <a href="http://weblog.raganwald.com/2008/01/objectandand-objectme-in-ruby.html">Ruby blog post</a>, <br />
      a <a href="https://gist.github.com/1025583">JavaScript Gist</a>,<br />
      And a <a href="http://d.hatena.ne.jp/javascripter/20081107/1226046467">Japanese Blog post</a>.<br />
      Tested on IE6, IE7, Firefox 7, Chrome 14, Safari 5 and Opera 11.5.
    </p>
    <div id="test-panel">Expected: 2,4,6,8<br /></div>
  </body>
</html>
	<!doctype html>
	<html lang="en">
	<head>
	<meta charset="utf-8" />
	<title>Object#tap in JavaScript</title>
	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
	<script type="text/javascript" src="http://sugarjs.com/javascripts/sugar-0.9.5.min.js"></script>
	<script type="text/javascript">
	jQuery.noConflict();
	(function($) {
	$(function(){

	// Object#tap method
	if(!Object.prototype.tap) { // if this method does not exist..
	Object.prototype.tap = function(name) {
	//console.debug(typeof(name));//debug
	if(typeof(name) == "function") {
	name.apply(this);
	} else {
	var args = Array.prototype.slice.call(arguments);
	this[name].apply(this, args.slice(1));
	}
	return this;
	};
	}

	// Fails
	//var withoutTap = [1, 2, 3, 4, 5].pop().map(function (n) { return n * 2 });
	//console.debug(withoutTap);//debug

	// Pass
	//var tapTest = [1, 2, 3, 4, 5].tap.pop.map { \|n\| n * 2 };
	var withTap = [1, 2, 3, 4, 5].tap(function() { this.pop(); }).map(function (n) { return n * 2 });
	//console.debug(withTap);//debug
	$("#test-panel").append("Test1: " + withTap.toString() + "<br />");

	var withTap2 = [1, 2, 3, 4, 5].tap("pop").map(function (n) { return n * 2 });
	//console.debug(withTap2);//debug
	$("#test-panel").append("Test2: " + withTap2.toString() + "<br />");

	var withTap3 = [1, 2].tap(function() { this.push(3, 4); }).map(function (n) { return n * 2 });
	//console.debug(withTap3);//debug
	$("#test-panel").append("Test3: " + withTap3.toString() + "<br />");

	var withTap4 = [1, 2].tap("push", 3, 4).map(function (n) { return n * 2 });
	//console.debug(withTap4);//debug
	$("#test-panel").append("Test4: " + withTap4.toString() + "<br />");

	var withTap5 = [1, 2, 3].tap(function() { if(this.none(4)) this.add(4); }).map(function (n) { return n * 2 });
	//console.debug(withTap5);//debug
	$("#test-panel").append("Test5: " + withTap5.toString() + "<br />");

	var withTap6 = [1, 2, 3, 4].tap(function() { if(this.last() === 5) this.pop(); }).map(function (n) { return n * 2 });
	//console.debug(withTap6);//debug
	$("#test-panel").append("Test6: " + withTap6.toString() + "<br />");

	});
	})(jQuery);
	</script>
	</head>
	<body>
	<h2>Object#tap in JavaScript</h2>
	<p>
	With the help of <a href="http://sugarjs.com">Sugar JavaScript lib</a>.<br />
	Based on a <a href="http://weblog.raganwald.com/2008/01/objectandand-objectme-in-ruby.html">Ruby blog post</a>, <br />
	a <a href="https://gist.github.com/1025583">JavaScript Gist</a>,<br />
	And a <a href="http://d.hatena.ne.jp/javascripter/20081107/1226046467">Japanese Blog post</a>.<br />
	Tested on IE6, IE7, Firefox 7, Chrome 14, Safari 5 and Opera 11.5.
	</p>
	<div id="test-panel">Expected: 2,4,6,8<br /></div>
	</body>
	</html>