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POCoffeescript "return" and jQuery plugin authoring - with templates
 

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    <p>I found this <a href="http://kaibun.net/blog/2013/04/19/a-fully-fledged-coffeescript-boilerplate-for-jquery-plugins/" rel="nofollow noreferrer">CoffeeScript boilerplate for jQuery plugins</a> which I have been studying and <em>[trying to]</em> use in a plugin that I'm <em>[trying to]</em> write. I have referenced the same boilerplate/template in a few other questions. I am an amateur at JavaScript and a complete new-comer to CoffeeScript. I'm trying to study and learn, but when something bothers me and I can't find a satisfactory answer through Google, I come here... So forgive my lack of knowledge and potential mistakes in any code that I write and present here.</p> <p>The CoffeeScript code compiles to this:</p> <pre><code>(function() { (function($, window, document) { var $this, methods, _anotherState, _flag, _internals, _settings; $this = void 0; _settings = { "default": 'cool!' }; _flag = false; _anotherState = null; methods = { init: function(options) { $this = $(this); $.extend(_settings, options || {}); return $this; }, doSomething: function(what) { return $this; }, destroy: function() { return $this; } }; _internals = { toggleFlag: function() { return _flag = !_flag; }, computeSomething: function(state, flag) { return flag != null ? flag : { state: "No, that's not right." }; } }; return $.fn.foobar = function(method) { if (methods[method]) { return methods[method].apply(this, Array.prototype.slice.call(arguments, 1)); } else if (typeof method === "object" || !method) { return methods.init.apply(this, arguments); } else { return $.error("Method " + method + " does not exist on jquery.foobar"); } }; })(jQuery, window, document); }).call(this); </code></pre> <p>From <a href="https://stackoverflow.com/questions/18106686/coffeescript-and-jquery-plugin-authoring">here</a> and <a href="https://stackoverflow.com/questions/18148261/jquery-plugin-authoring-in-coffeescript-with-conventionally-private-objects-a">here</a> I understand that the <code>(function(){...}).call(this)</code> wrapper, is a CoffeeScript feature and is meant to localize variables that are not explicitly declared to be global. <em>I later learnt that it can be suppressed during compilation too</em>. I also learned that I did not need to include <code>window</code> and <code>document</code> as arguments to the jQuery closure.</p> <p>As I studied it more (and tried to edit it), I saw that in the compiled code, the closure (which is a function) returns <code>$.fn.foobar</code> right where it defines it. Since that function is anonymous and isn't gonna be called anyway, I suppose the returned value doesn't matter. But still, what if I put a <code>return</code> statement in the CoffeeScript code like this:</p> <pre><code>$.fn.foobar = (method) -&gt; if methods[method] methods[method].apply this, Array::slice.call(arguments, 1) else if typeof method is "object" or not method methods.init.apply this, arguments else $.error "Method " + method + " does not exist on jquery.foobar" # -- This, right here... return # -- </code></pre> <p>It no longer compiles to <code>return $.fn.foobar = ...</code> but instead just <code>$.fn.foobar = ...</code>. I think that doesn't make any difference, rather it makes the JS output more... <em>clean</em>... if you will. But I need to confirm that. How does that effect the execution of the script?</p> <p>Moreover, in the CoffeeScript code, the author says that inside <code>methods.init()</code> I need to perform all operations on <code>$this.each</code> but instead, if I do</p> <pre><code> init: (options) -&gt; $.extend _settings, (options or {}) return $(@).each () -&gt; # I don't really need return, do I? # In here @ is one element (out of the array of elements) return # This is to suppress any returns inside .each() </code></pre> <p>So this is it... Here are my <strong>questions</strong>:</p> <ol> <li>Is there a reason not to <code>return</code> from the anonymous function in the CoffeeScript code? How exactly does that differ from the original CoffeeScript code?</li> <li>What would be a proper way to iterate over all items in the jQuery array on which the plugin is called, while maintaining chainability.</li> </ol> <hr> <p><strong>NOTE</strong>: I did not include the CoffeeScript code to avoid the post getting too long. But I have provided a link to the page where the code is listed. However, if it's a trouble, do let me know in comments and I shall edit the post to contain the CoffeeScipt code, too. Thank you for your time.</p>
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    1. COWhat kind of 'chainability' do you have in mind?
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    2. CO@hpaulj Chainability as in `$('#id.class').plugin(args).someOtherjQueryFunction(args)`. That is only possible if `plugin` returns `$('#id.class')`. And if `$('#id.class')` corresponds to an array of elements instead of just one elements, all of these elements should be returned, not just one of them.
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