closures

问题 There are two functions as shown below. Most of the functionality is the same in both. Its idea is to get the output of the webservice from getResponse() [Helper Callback], parse and pass the info to wrapper call back through getResult(). static func getAllDealers(dealerSearchServiceDomain: ARSDealerSearchServiceDomain, wrapperCallback:(getResult: () throws -> Void) -> Void) throws { try ARSInputValidator.validateZipCode(dealerSearchServiceDomain.zip) try ARSDealerConnection.getAllDealers

问题 I am new to python and I have to design a Python API(version - 2.7) similar to an existing Java API Python version - 2.7 The Java API is as follows public interface Process<T> { Future<T> create(Client<T> client) //Other methods } public interface Client<T> extends Serializable { T execute(ClientContext c) //Other methods } public interface ClientContext { File createFile(String path) //Other methods } The equivalent Python API design that I have come up with is Approach1 class Process: _

问题 Update: This kind of implementation is simply bad, and I've removed that answer. I just answered this question. The OP asked for the solution of a private member which can only be accessible by prototype methods. For my answer, I would not suggest to do that but propose the code of its possibility. (And sorry, I do not have a good idea with the title .. ) Code function A(prop1) { var myFunc=A.prototype.myFunc; var that=this; A.prototype.myFunc=function () { if (this===that) { alert(prop1); //

问题 Is there any difference between limiter 1 and limiter 2? var limiter1 = function(limiter){ return function(item){ return item > limiter; }; }; var limiter2 = function(limiter){ return function(limiter,item){ return item > limiter; }.bind(this,limiter); }; 回答1: In most cases, they will function identically. However... If you ever start to actually use the value of this , the function returned by limiter1 will be unbound (so a consumer could change the value with a call to Function.prototype

问题 I'm writing Rust wrappers for C bindings so that they look more Rusty. One such C function is this: void mosquitto_connect_callback_set( struct mosquitto * mosq, void (*on_connect)(struct mosquitto *, void *, int) ) I'm using the below technique to pass a Rust closure as the user data to above binding ( void* in the callback) so that the Rust closure will be called when the C callback is invoked. // Registered callback is called when the broker sends a CONNACK message in response // to a

问题 I want to know how to pass data using closure. I know that there are three types of data pass approaches: delegate Notification Center closure I want proper clarification of closure with an example. 回答1: Well passing data with blocks / closures is a good and reasonable approach and much better than notifications. Below is the same code for it. First ViewController (where you make object of Second ViewController) @IBAction func push(sender: UIButton) { let v2Obj = storyboard?

问题 This is related to this Anyway what I need is actually something slightly different I need some way of doing this: function run(arg) { this.ran = this.ran || false; if (!this.ran) init; /* code */ this.ran = true; } This works fine, I just want to make sure that this code works even when this in case it was called with call() or apply() Check this out for what I'm talking about, All of the calls after the first one should all be true, no matter the context 回答1: to get full use of closures, i

问题 I have a for loop iterating through a variable number of draggable elements, creating a stop-event callback for each. The callback function needs to know the index of the item that it is linked to. I've encountered what I think is a closure problem: when the callbacks are fired off, the state of the loop iterator index variable that gets passed to the callback (_x) is the last value of the loop iterator index, rather than the value of that iterator index at the time the callback function was

问题 In terms of solving the problem, I have a fully working solution that I just finished here: // synchronous dynamic script loading. // takes an array of js url's to be loaded in that specific order. // assembles an array of functions that are referenced more directly rather than // using only nested closures. I couldn't get it going with the closures and gave up on it. function js_load(resources, cb_done) { var cb_list = []; // this is not space optimal but nobody gives a damn array_each

问题 Trying to create a "class" in JavaScript that can both have a function at the root of the class and other sub functions: Validate(word) - returns true or false if the word is validated Validate.getRule() - returns the rules used to validate the word. Here is example code: var Validate = function (word) { this.rule = /^[a-m]$/; if (word) { return this.rule.test(word); } else { return { getRule : function() { return this.rule;} }; } }(); This works the first time if you call it with no