anonymous-function

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: What is the purpose of a self executing function in javascript? Hopefully quite a straight forward question: What is the purpose of using self invoking anonymous functions? Is it simply to prevent "polluting" the global scope with variables etc.? Or are there other advantages to using them? 回答1: Out of my personal experience, other than using anonymous functions for inducing a scope, I have also used it in for

问题 I am just starting out with PHP, and I am wondering if there is a way to add an anonymous function to a class instance. For instance, lets say... class A{ public B; } $c = new A(); //This is where I am getting a little confused... //The following wont work $c->B = function(){echo('HelloWorld');}; $c->B(); What I am hoping to do is reuse the same spit of code in a great number of different applications, and make it so that I can just 'swap-out' and replace functions in specific instances. I am

问题 is there any way to serialize an anonymous function in php? i have found this http://www.htmlist.com/development/extending-php-5-3-closures-with-serialization-and-reflection/ protected function _fetchCode() { // Open file and seek to the first line of the closure $file = new SplFileObject($this->reflection->getFileName()); $file->seek($this->reflection->getStartLine()-1); // Retrieve all of the lines that contain code for the closure $code = ''; while ($file->key() < $this->reflection-

问题 I have a javascript function which should return a geocoding for a string: function codeAddress(address) { var result = (new google.maps.Geocoder()).geocode( { 'address': address}, function(results, status) { if (status == google.maps.GeocoderStatus.OK) { return String(results[0].geometry.location.Ya)+','+String(results[0].geometry.location.Za) } else { return status; } }); console.log(result); return result } However it returns "undefined". I understand the bug here,i.e, since javascript is

问题 I assumed lambda functions , delegates and anonymous functions with the same body would have the same "speed", however, running the following simple program: static void Main(string[] args) { List<int> items = new List<int>(); Random random = new Random(); for (int i = 0; i < 10000000; i++) { items.Add(random.Next()); } Stopwatch watch; IEnumerable<int> result; Func<int, bool> @delegate = delegate(int i) { return i < 500; }; watch = Stopwatch.StartNew(); result = items.Where(@delegate); watch

问题 Mailcore has a cool method that downloads an attachment and accepts a block as a parameter to return download progress: - (CTCoreAttachment *)fetchFullAttachmentWithProgress:(CTProgressBlock)block; where CTProgressBlock is defined as typedef void (^CTProgressBlock)(size_t curr, size_t max); so typically I would use it like so: //AttachmentDownloader.m int fileNum = x; // explained later CTCoreAttachment* fullAttachment = [attachment fetchFullAttachmentWithProgress:^(size_t curr, size_t max) {

问题 I'm trying to learn PHP, and now I'm stuck in 'static anonymous function'. I found this in a tutorial (http://www.slideshare.net/melechi/php-53-part-2-lambda-functions-closures-presentation) "Object Orientation Lambda Functions are Closures because they automatically get bound to the scope of the class that they are created in. ' $this ' is not always needed in the scope. Removing ' $this ' can save on memory. You can block this behaviour by declaring the Lambda Function as static." What is

问题 Background: I have a recursive function implemented by a Z-combinator as is shown here and here so it makes no use of arguments.callee since it will be deprecated in upcoming ES6 . Issue The main issue with the Z-combinator and all recursive anonymous functions I've seen so far is that they updates de this value to the inner function scope (the self-returned at the return clause), so the this that references the top level is lost, and I want to maintain it through all the inner functions. Is

问题 I have a hash with a few values that are not scalar data but rather anonymous subroutines that return scalar data. I want to make this completely transparent to the part of the code that looks up values in the hash, so that it doesn't have to be aware that some of the hash values may be anonymous subroutines that return scalar data rather than just plain old scalar data. To that effect, is there any way to have the anonymous subroutines executed when their keys are accessed, without using any

问题 I would like a function (for example, a fit function) to return an anonymous function (usually stored in a struct ) that I can save and use later. However, passing @func tends to pass a function pointer rather than the function itself. Is an inline function the only way to do this? I would like to avoid inline because it is extremely slow. If that question is not clear, here is a sample of problematic code: I write a testFunc.m file in some PATH %testFunc.m function myfunc = testFunc() myfunc