If it&#39;s a user defined function you can use:

    console.log(callback.toString());

Otherwise you&#39;ll just get something like `[native code]` since built in functions are not written in JavaScript.

Example:

    function x(){}
    
    // Prints &quot;function x(){}&quot;
    (function(callback){ console.log(callback.toString()); })(x);

In play1, I usually get all data in actions, use them directly in views. Since we don&#39;t need to explicitly declare parameters in view, this is very easy.

But in play2, I found we have to declare all the parameters(including `request`) in the head of views, it will be very boring to get all data in actions and pass them into views.

For example, if I need to display menus which are loaded from database in the front page, I have to define it in `main.scala.html`:

    @(title: String, menus: Seq[Menu])(content: Html)    

    &lt;html&gt;&lt;head&gt;&lt;title&gt;@title&lt;/title&gt;&lt;/head&gt;
    &lt;body&gt;
        &lt;div&gt;
        @for(menu&lt;-menus) {
           &lt;a href=&quot;#&quot;&gt;@menu.name&lt;/a&gt;
        }
        &lt;/div&gt;
        @content
    &lt;/body&gt;&lt;/html&gt;

Then I have to declare it in every sub page:

    @(menus: Seq[Menu])

    @main(&quot;SubPage&quot;, menus) {
       ...
    }

Then I have to get the menus and pass it to view in every action:

    def index = Action {
       val menus = Menu.findAll()
       Ok(views.html.index(menus))
    }

    def index2 = Action {
       val menus = Menu.findAll()
       Ok(views.html.index2(menus))
    }

    def index3 = Action {
       val menus = Menu.findAll()
       Ok(views.html.index(menus3))
    }

For now it&#39;s only one parameter in `main.scala.html`, what if there are many?

So at last, I decided to all `Menu.findAll()` directly in view:

    @(title: String)(content: Html)    

    &lt;html&gt;&lt;head&gt;&lt;title&gt;@title&lt;/title&gt;&lt;/head&gt;
    &lt;body&gt;
        &lt;div&gt;
        @for(menu&lt;-Menu.findAll()) {
           &lt;a href=&quot;#&quot;&gt;@menu.name&lt;/a&gt;
        }
        &lt;/div&gt;
        @content
    &lt;/body&gt;&lt;/html&gt;

I don&#39;t know if it is good or recommended, is there any better solution for this?

How to avoid passing parameters everywhere in play2?

One simple question: is it possible to return a value in `AsyncTask`?

    //AsyncTask is a member class
    private class MyTask extends AsyncTask&lt;Void, Void, Void&gt;{

	    protected Void doInBackground(Void... params) {
             //do stuff
             return null;
	    }

	    @Override
	    protected void onPostExecute(Void result) {
	        //do stuff
            //how to return a value to the calling method?
	    }
	}

And then within my `Activity`/`Fragment`:

    // The task is started from activity
    myTask.execute()
    // something like this?
    myvalue = myTask.getvalue() 

**EDIT:
This was asked a long time ago where I wasn&#39;t familiar with Java, now that I&#39;m better with it, I &#39;ll do a quick summary:**

The point of async task is that the task is `asynchronous`, meaning that after you call `execute()` on the task, the task starts running on a thread of its own. returning a value from asynctask would be pointless because the original calling thread has already carried on doing other stuff (thus the task is asynchronous). 

Think of time:
At one point of time, you started a task that will run in parallel with the main thread. When the parallel-running task completed, time has also elapsed on the main thread. The parallel task cannot go back in time to return a value to the main thread.

I was coming from C so I didn&#39;t know much about this. But it seems that lots of people are having the same question so I thought I would clear it up a bit.




Return a value from AsyncTask in Android



I&#39;m trying to log a function in javascript:
      

    console.log(callback)
    &gt;&gt;[Function]

I want to see what the function is. Can I do that? Thanks.

console.log javascript [Function]

I'm trying to log a function in javascript:
<pre><code class="hljs language-javascript">console.log(callback)
>>[Function]
</code></pre>
I want to see what the function is. Can I do that? Thanks.

I need to show a currency value in the format of `1K` of equal to one thousand, or `1.1K`, `1.2K`, `1.9K` etc, if its not an even thousands, otherwise if under a thousand, display normal `500`, `100`, `250` etc, using JavaScript to format the number?



Format a number as 2.5K if a thousand or more, otherwise 900

How can I estimate the size of my JavaScript file after it is gzipped? Are there online tools for this? Or is it similar to using winzip for example?

How can I estimate the size of my gzipped script?

I&#39;m working on an app where I&#39;m going to use both HTML5 in UIWebView and native iOS framework together. I know that I can implement communication between JavaScript and Objective-C. Are there any libraries that simplify implementing this communication? I know that there are several libraries to create native iOS apps in HTML5 and javascript (for example AppMobi, PhoneGap), but I&#39;m not sure if there is a library to help create native iOS apps with heavy JavaScript usage. I need to:

 1. Execute JS methods from Objective-C
 2. Execute Objective-C methods from JS
 3. Listen to native JS events from Objective-C (for example DOM ready event)

iOS JavaScript bridge

I tried this:

    // mod.js
    var a = 1;
    this.b = 2;
    exports.c = 3;

    // test.js
    var mod = require(&#39;./mod.js&#39;);
    console.log(mod.a);    // undefined
    console.log(mod.b);    // 2
    console.log(mod.c);    // 3, so this === exports?

So I image that require() may be implement like this:

    var require = function (file) {
        var exports = {};
        var run = function (file) {
            // include &quot;file&quot; here and run
        };
        run.apply(exports, [file]);
        return exports;
    }

Is that right? Please help me to understand require(), or where can I find the source code. Thanks!

How does require() in node.js work?

What method would be best to use to selectively set a single or multiple radio button(s) to a desired setting with JavaScript?

How to set radio button status with JavaScript

Check out this [code][1] :

    &lt;a href=&quot;#&quot; id=&quot;link&quot;&gt;Link&lt;/a&gt;
    &lt;span&gt;Moving&lt;/span&gt;

    $(&#39;#link&#39;).click(function () {
        console.log(&quot;Enter&quot;);
        $(&#39;#link&#39;).animate({ width: 200 }, 2000, function() {
             console.log(&quot;finished&quot;);            
        });    
        console.log(&quot;Exit&quot;);    
    });

As you can see in the console, the &quot;animate&quot; function is asynchronous, and it &quot;fork&quot;s the flow of the event handler block code. In fact :

    $(&#39;#link&#39;).click(function () {
        console.log(&quot;Enter&quot;);
        asyncFunct();
        console.log(&quot;Exit&quot;);    
    });
    
    function asyncFunct() {
        console.log(&quot;finished&quot;);
    }

follow the flow of the block code!

If I wish to create my `function asyncFunct() { }` with this behaviour, how can I do it with javascript/jquery? I think there is a strategy without the use of  `setTimeout()`
    ​

  [1]: http://jsfiddle.net/5H9XT/5/

How can I create an Asynchronous function in Javascript?

I would like to execute a single PHP statement like `if(function_exists(&quot;my_func&quot;)) echo &#39;function exists&#39;;` directly with the command line without having to use a separate PHP file.

How is it possible?


How can I execute PHP code from the command line?

I have a Python function which takes several arguments. Some of these arguments could be omitted in some scenarios.

	def some_function (self, a, b, c, d = None, e = None, f = None, g = None, h = None):
		#code

The arguments `d` through `h` are strings which each have different meanings. It is important that I can choose which optional parameters to pass in any combination. For example, `(a, b, C, d, e)`, or `(a, b, C, g, h)`, or `(a, b, C, d, e, f`, or all of them (these are my choices). 

It would be great if I could overload the function - but I read that Python does not support overloading. I tried to insert some of the required int arguments in the list - and got an argument mismatch error.

Right now I am sending empty strings in place of the first few missing arguments as placeholders. I would like to be able to call a function just using actual values.

Is there any way to do this? Could I pass a list instead of the argument list?

Right now the prototype using ctypes looks something like:

	_fdll.some_function.argtypes = [c_void_p, c_char_p, c_int, c_char_p, c_char_p, c_char_p, c_char_p, c_char_p]

How do I create a Python function with optional arguments?

So I figured when making function pointers, you do not need the `operator &amp;` to get the address of the initial function:

    #include &lt;stdio.h&gt;

    double foo (double x){
        return x*x;
    }

    int main () {

        double (*fun1)(double) = &amp;foo;
        double (*fun2)(double) =  foo;
        
        printf(&quot;%f\n&quot;,fun1(10));
        printf(&quot;%f\n&quot;,fun2(10));
        
        printf(&quot;fun1 = %p \t &amp;foo = %p\n&quot;,fun1, &amp;foo);
        printf(&quot;fun2 = %p \t  foo = %p\n&quot;,fun2,  foo);       
        
        int a[10];
        
        printf(&quot;  a = %p \n &amp;a = %p  \n&quot;,a,&amp;a);
        
        return 0;
    }

output:

    &gt;./a.out 
    100.000000
    100.000000
    fun1 = 0x4004f4 	 &amp;foo = 0x4004f4
    fun2 = 0x4004f4 	  foo = 0x4004f4
      a = 0x7fff26804470 
     &amp;a = 0x7fff26804470 

Then I realized this is also true for arrays, meaning that if you have `int a[10]` both `a` and `&amp;a` point to the same location. Why is that with arrays and functions? Is the address saved in a memory location that has the same address as the value(address) being saved in it?

Function pointers and address of a function

What I understand is that this shouldn&#39;t be done, but I believe I&#39;ve seen examples that do something like this (note code is not necessarily syntactically correct but the idea is there)

    typedef struct{
        int a,b;
    }mystruct;

And then here&#39;s a function

    mystruct func(int c, int d){
        mystruct retval;
        retval.a = c;
        retval.b = d;
        return retval;
    }

I understood that we should always return a pointer to a malloc&#39;ed struct if we want to do something like this, but I&#39;m positive I&#39;ve seen examples that do something like this. Is this correct? Personally I always either return a pointer to a malloc&#39;ed struct or just do a pass by reference to the function and modify the values there. (Because my understanding is that once the scope of the function is over, whatever stack was used to allocate the structure can be overwritten).

Let&#39;s add a second part to the question: Does this vary by compiler? If it does, then what is the behavior for the latest versions of compilers for desktops: gcc, g++ and Visual Studio?

Thoughts on the matter?


Is it safe to return a struct in C or C++?

I found that I am confusing between web framework and web server.

`Apache is a web server.`

`Tornado is a web server written in Python.`

`Nginx is a web server written in C`

`Zend is a web framework in php`

`Flask/Bottle is a web framework in Python`

`RoR is a web framework written in Ruby`

`Express is a web framework written in JS under Node.JS`

Can we say node.js is a web server??? I am so confused between web server/ framework.

If somehow node.js is kind of webserver, not webframework (Express does), why do we need to put the whole node.js on top of Nginx server in useful practice??
[Question on SO][1]

Who can help???

Kit


  [1]: https://stackoverflow.com/questions/9287747/why-do-we-need-apache-under-node-js-express-web-framework

Can we say node.js is a web server?

I&#39;m trying to install the dependencies of some example: npm&#39;s `express 2.5.8` that I&#39;ve downloaded, but all of the apps throw the same error:

    c:\node\stylus&gt;npm install -d
    npm info it worked if it ends with ok
    npm info using npm@1.1.1
    npm info using node@v0.6.11
    npm ERR! Couldn&#39;t read dependencies.

    npm ERR! Error: ENOENT, no such file or directory &#39;c:\node\stylus\package.json&#39;
    npm ERR! You may report this log at:
    npm ERR!     &lt;http://github.com/isaacs/npm/issues&gt;
    npm ERR! or email it to:
    npm ERR!     &lt;npm-@googlegroups.com&gt;
    npm ERR!
    npm ERR! System Windows_NT 6.1.7600
    npm ERR! command &quot;C:\\Program Files (x86)\\nodejs\\\\node.exe&quot; &quot;C:\\Program File
    s (x86)\\nodejs\\node_modules\\npm\\bin\\npm-cli.js&quot; &quot;install&quot; &quot;-d&quot;
    npm ERR! cwd c:\node\stylus
    npm ERR! node -v v0.6.11
    npm ERR! npm -v 1.1.1
    npm ERR! path c:\node\stylus\package.json
    npm ERR! code ENOENT
    npm ERR! message ENOENT, no such file or directory &#39;c:\node\stylus\package.json&#39;

    npm ERR! errno {}
    npm ERR!
    npm ERR! Additional logging details can be found in:
    npm ERR!     c:\node\stylus\npm-debug.log
    npm not ok

The blockage appears to be: 

&gt; no such file or directory &#39;c:\node\stylus\package.json

Did I miss a step that creates the `package.json` ?

I&#39;m running:

* Windows 7 64 bit
* npm 1.1.1
* node 6.11
* express 2.5.8

npm can&#39;t find package.json

Is NodeJS a good framework/codebase for a large server-side application? What I am looking to develop is a large application that will require HTTP transactions (states) and large amounts of concurrent users.

From what I&#39;ve read online, NodeJS is not the best tool to use when it comes to large programs. What I&#39;ve come across is as follows:

- NodeJS runs on JavaScript which runs on event loops which are not very efficient when used in bulk.
- NodeJS may be non-blocking, but all the requests are handled within a single thread so this can cause a bit of a bottleneck when many requests are handled.
- NodeJS is built atop its own HTTP server so future maintenance will require its own sysadmin/developer hybrid to take care of the application.
- There isn&#39;t as much well-tested and diverse software available for NodeJS that helps you build a bigger application.

Is there something I&#39;m missing? Is NodeJS really as powerful as it can be?

Using NodeJS for a big project

I don&#39;t understand several things about nodejs. Every information source says that node.js is more scalable than standard threaded web servers due to the lack of threads locking and context switching, but I wonder, if node.js doesn&#39;t use threads how does it handle concurrent requests in parallel? What does event I/O model means? 

Your help is much appreciated. 
Thanks

How node.js works?

I want to write some result to the console in ASP.NET (C#).
It works in a Window application, but a Web application does not work.
Here is what I have tried:

    protected void btonClick_Click(object sender, EventArgs e)
    {
        Console.WriteLine(&quot;You click me ...................&quot;);
        System.Diagnostics.Debug.WriteLine(&quot;You click me ..................&quot;);
        System.Diagnostics.Trace.WriteLine(&quot;You click me ..................&quot;);
    }

But I see nothing in the Output panel. How do I solve this problem? 


How to use Console.WriteLine in ASP.NET (C#) during debug?

I&#39;d like to use console.log() to log messages *without* appending a new line after each call to console.log(). Is this possible?

Chrome JavaScript developer console: Is it possible to call console.log() without a newline?

I had to change the console background color to white because of eye problems, but the font is gray colored and it makes the messages unreadable. How can I change it?

How to change node.js&#39;s console font color?

Is there a way to hide the `&quot;XHR finished loading&quot;` messages in the console?

When loading external data, console says: XHR finished loading

&lt;br/&gt;
I have a console application in which I want to write the name of a file.

```
Process.Start(&quot;blah.bat&quot;);
```

Normally, I would have something like that in windows application by writing the name of the file `&#39;blah.bat&#39;` to **Settings** file in **Properties**.&lt;br/&gt;
However, here I didn&#39;t find any *Settings* file and I added an **app.config** for the same purpose.&lt;br/&gt;

I am not sure what to write here in **app.config**, that would lead to me to achieve similar thing as in ***Windows Forms***.&lt;br/&gt;

For eg: In windows forms. `Process.Start(Properties.Settings.Default.BatchFile);`&lt;br/&gt;
where `BatchFile` is a string in settings file in Properties.

Content Type	Original Author	Original Content on Stackoverflow
Question	Harry	View Question on Stackoverflow
Solution 1 - Javascript	Paul	View Answer on Stackoverflow

console.log javascript [Function]

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Return a value from AsyncTask in Android

How to avoid passing parameters everywhere in play2?

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