I want to do this in Javascript: function Z( f ) { f(); } function A() { this.b = function() { Z( function () { this.c() } ); } this.c = function() { alert('hello world!'); } } var foo = new A(); foo.b(); It can be accomplished this way: function Z( f ) { f(); } function A() { var self = this; this.b =...
I have seen & used nested functions in Python. They match the definition of a closure. It is not closure simply because it is not used by external world? UPDATE: I was reading about closures & it got me thinking about this concept with respect to Python. A little bit of search got me to the article someone in the comments pointed to. B...
Pretty sure the answer to this question is "closures" but I'm having a hard time getting it right. Given the following: var total = 0; db.readTransaction(function (tx) { tx.executeSql('SELECT COUNT(id) AS mytotal FROM sometable', [], function (tx, results) { total =results.rows.item(0).mytotal; conso...
I have a JavaScript singleton object created with closure method: /** * This is the singleton. * * @namespace window.Something.Singleton */ window.Something.Singleton = (function() { /** * Foo method. * * @return {String} this method always returns with <code>bar</code> */ function _foo() { return "bar"; } /** ...
Hi, What's the difference between these functions? Thanks for reply! Function #1 var myQuery = (function() { (...) })(); Function #2 var myQuery = (function() { (...) }); ...
Is there a way that one can implicitly declare top-level variables as global for use in closures? For example, if working with code such as this: $a = 0; //A TOP-LEVEL VARIABLE Alpha::create('myAlpha') ->bind(DataSingleton::getInstance() ->query('c') ) ->addBeta('myBeta', function($obj){ $obj->bind(DataSing...
Just thought I'd share this in case anyone else has run into this. I did something similar today and it took me a while to figure out why this was causing a problem at runtime. This code: Public Class foo Public bar As String = "blah" End Class Public Sub DoInline() Dim o As New foo Dim f As Func(Of String) With o f = Func...
I've been asking a few questions on this topic recently, so I feel it appropriate to link up the associated question(s). http://stackoverflow.com/questions/4054424/php-closures-and-implicit-global-variable-scope I've got a set of classes that use closures as in the example below (keep in mind I quickly punched together this example for...