anonymous-function | 易学教程

How to call anonymous function in C#?

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问题 I am interested if it's possible using C# to write a code analogous to this Javascript one: var v = (function() { return "some value"; })() The most I could achieve is: Func<string> vf = () => { return "some value"; }; var v = vf(); But I wanted something like this: // Gives error CS0149: Method name expected var v = (() => { return "some value"; })(); Are there some way to call the function leaving it anonymous? 回答1: Yes, but C# is statically-typed, so you need to specify a delegate type.

Javascript arguments.callee what is it for

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I haven't found any complete cross-browser doc of this variable. What is arguments.callee for? how does it work? Which arguments does it have? Elias Van Ootegem arguments.callee is a reference to the function that is currently being called. First things first: don't use it: if you're in a strict context, it'll just spew errors. However, personally -and I'm not alone in this - I'll miss this property. Before I get to explain why, I'll give you a pseudo-example of when you might use this: var looper = (function(someClosureVar) { setTimeout((function(resetTimeout) { return function() { //do stuff

Wanted: Matlab example of an anonymous function returning more than 1 output

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I use anonymous functions for simple data value transforms. The anonymous functions are defined with the following syntax sqr = @(x) x.^2; I would like to have a simple anonymous function that returns more than one output that can be used as follows . . . [b,a] = myAnonymousFunc(x); The Matlab documentation suggests that this is possible, but it does not give an example of the syntax needed to define such a function. http://www.mathworks.co.uk/help/techdoc/matlab_prog/f4-70115.html#f4-71162 What is the syntax to define such a function [ in a single line, like the code example at the top of my

Difference between function with a name and function without name in Javascript

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问题 1. function abc(){ alert("named function"); } v/s 2. function(){ alert("Un-Named function"); } Kindly explain from beginners point. 回答1: They work exactly the same. It's only in how you are able to run them that they are different. So example #1 you could call again at any point with abc(); . For example 2, you would either have to pass it as a parameter to another function, or set a variable to store it, like this: var someFunction = function() { alert("Un-Named function"); } Here's how to

Anonymous recursive function in Scala

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问题 Is there a way to write an anonymous function that is recursive in Scala? I'm thinking of something like this: ((t: Tree) => { print(t.value); for (c <- t.children) thisMethod(c) })(root) (Related question: Which languages support *recursive* function literals / anonymous functions?) 回答1: As described in the link you posted. You can use Y-combinator. Here is example: scala> def fix[A,B](f: (A=>B)=>(A=>B)): A=>B = f(fix(f))(_) fix: [A,B](f: ((A) => B) => (A) => B)(A) => B scala> val fact = fix

Anonymous function shorthand

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There's something I don't understand about anonymous functions using the short notation #(..) The following works: REPL> ((fn [s] s) "Eh") "Eh" But this doesn't: REPL> (#(%) "Eh") This works: REPL> (#(str %) "Eh") "Eh" What I don't understand is why (#(%) "Eh") doesn't work and at the same time I don't need to use str in ((fn [s] s) "Eh") They're both anonymous functions and they both take, here, one parameter. Why does the shorthand notation need a function while the other notation doesn't? Barmar #(...) is shorthand for (fn [arg1 arg2 ...] (...)) (where the number of argN depends on how many

How can I write an anonymous function in Java?

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问题 Is it even possible? 回答1: if you mean an anonymous function, and are using a version of Java before Java 8, then in a word, no. (Read about lambda expressions if you use Java 8+) However, you can implement an interface with a function like so : Comparator<String> c = new Comparator<String>() { int compare(String s, String s2) { ... } }; and you can use this with inner classes to get an almost-anonymous function :) 回答2: Here's an example of an anonymous inner class. System.out.println(new

Anonymous functions pre PHP 5.3.0

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Is there an alternative to anonymous functions in versions of PHP previous to 5.3.0? There is create_function but it generally isn't recommended. If you're using OOP, you'd be better off defining a one-off private member to use with a callback instead. Yes, create_function() There are two choices. First is to create a function, inside a function. Unfortunately, it will pollute the global namespace. The second choice is to use create_function . 来源： https://stackoverflow.com/questions/3694620/anonymous-functions-pre-php-5-3-0

PHP modify code to avoid anonymous functions

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I've found some solutions to a sorting problem I've been having, but the code uses anonymous functions in PHP. Im using version 5.2.17 and I believe anonymous functions are not supported. How would I change the following blocks of code so I can use them in PHP 5.2.17 $keys = array_flip($order); usort($items, function($a, $b) use($keys) { return $keys[$a['id']] - $keys[$b['id']]; }); from PHP sort multidimensional array by other array And $sorted = array_map(function($v) use ($data) { return $data[$v - 1]; }, $order); from PHP - Sort multi-dimensional array by another array UPDATE: One of the

Implementing anonymous functions in Fortran

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This question is successor of my previous question Implementing minimization method . In current question, I simplified my problem and here is the sample MATLAB code. I want to implement it in Fortran. %Script script1.m clear vars; close all; clc; fun1 = @(x1,x2) 3*x1^2 + 4*x2^2 + 5*x1 + 6*x2 + 10; lower = -2; upper = 0; fun5 = fun15(fun1); %fun5 is 'intermediate' function %calling minimization function [location,value]=minimize1(fun5,lower,upper) In the script1.m, I created a function handle fun1 and want to assign values to it as shown in the fun15.m %fun15.m function fun2 = fun15( fun1 )