The official recommendation is formatting your code with

    go fmt

or using the gofmt command directly

    gofmt -w .

You can read more about it [here](http://blog.golang.org/go-fmt-your-code) on the golang.org blog, or from the [Effective go](http://golang.org/doc/effective_go.html#formatting) document:

&gt;_Indentation_  
&gt;  We use tabs for indentation and gofmt emits them by default. Use spaces only if you must.

_EDIT 2:_ he original answer at the bottom is now incorrect. The correct section of the [linked source file](http://golang.org/src/cmd/gofmt/doc.go) (current 30/12/2019) is:

&gt;Gofmt formats Go programs.
It uses tabs for indentation and blanks for alignment.
Alignment assumes that an editor is using a fixed-width font.

Thanks to [TehSphinX](https://stackoverflow.com/users/6220193/tehsphinx) for pointing this out!

__ALL INFO BELOW THIS LINE IS NOW INCORRECT__

_EDIT:_ The original answer at the bottom is now incorrect. The correct section of the linked source file (current 25/07/2014) is:

&gt;Gofmt formats Go programs.  
It uses tabs (width = 8) for indentation and blanks for alignment.


_Original answer (deprecated):_

    Formatting control flags:
    	-comments=true
    		Print comments; if false, all comments are elided from the output.
    	-tabs=true
    		Indent with tabs; if false, spaces are used instead.
    	-tabwidth=8
    		Tab width in spaces.



Is there any difference between a **web API** and a **web service** ? Or are they one and the same ? 

What is the difference between a web API and a web service?

In `Ubuntu 10.04` I just installed `rbenv`.
The install command is not present.

    rbenv 0.4.0-49-g8b04303
    Usage: rbenv &lt;command&gt; [&lt;args&gt;]
    
    Some useful rbenv commands are:
       commands    List all available rbenv commands
       local       Set or show the local application-specific Ruby version
       global      Set or show the global Ruby version
       shell       Set or show the shell-specific Ruby version
       rehash      Rehash rbenv shims (run this after installing executables)
       version     Show the current Ruby version and its origin
       versions    List all Ruby versions available to rbenv
       which       Display the full path to an executable
       whence      List all Ruby versions that contain the given executable
    
    See `rbenv help &lt;command&gt;&#39; for information on a specific command.
    For full documentation, see: https://github.com/sstephenson/rbenv#readme

What am I missing?

The command rbenv install is missing

Is there a standard Google Go coding conventions document somewhere that sets whether tabs or spaces are preferred for indentation in Go source code?

What is the official recommendation, if any?

Indentation in Go: tabs or spaces?

<p>Is there a standard Google Go coding conventions document somewhere that sets whether tabs or spaces are preferred for indentation in Go source code?</p>
<p>What is the official recommendation, if any?</p>


http://golang.org/pkg/strconv/


http://play.golang.org/p/4VNRgW8WoB

How do I convert a float number into string format?
This is google playground but not getting the expected output. (2e+07)
I want to get &quot;21312421.213123&quot;



    package main

    import &quot;fmt&quot;
    import &quot;strconv&quot;

    func floattostr(input_num float64) string {
	
         	// to convert a float number to a string
	    return strconv.FormatFloat(input_num, &#39;g&#39;, 1, 64)
     }

     func main() {
	      fmt.Println(floattostr(21312421.213123))
	      // what I expect is &quot;21312421.213123&quot; in string format
     }


Please help me get the string out of float number. Thanks

formatFloat : convert float number to string

    type Stat struct {
    	counters     map[string]*int64
    	countersLock sync.RWMutex
        averages     map[string]*int64
        averagesLock sync.RWMutex
    }


It is called below

    func (s *Stat) Count(name string) {
    	s.countersLock.RLock()
    	counter := s.counters[name]
    	s.countersLock.RUnlock()
    	if counter != nil {
    		atomic.AddInt64(counter, int64(1))
    		return
    	}
    }

My understanding is that we first lock the receiver s (which is a type Stat) and then we add to it if the counter does exist.

Questions:

Q1: why do we need to lock it? What does `RWMutex` even mean?

Q2: `s.countersLock.RLock()` - does this lock up the entire receiver s or only the counters field in type Stat?

Q3: `s.countersLock.RLock()` - does this lock up the averages field?

Q4: Why should we use `RWMutex`? I thought channel was the preferred way to handle concurrency in Golang?

Q5: What is this `atomic.AddInt64`. Why do we need atomic in this case? 

Q6: Why would we unlock right before we add to it?

How to use RWMutex?

I&#39;m puzzled with dependencies. I want to be able to replace some function calls with mock ones. Here&#39;s a snippet of my code:

    func get_page(url string) string {
        get_dl_slot(url)
        defer free_dl_slot(url)
        
        resp, err := http.Get(url)
        if err != nil { return &quot;&quot; }
        defer resp.Body.Close()
        
        contents, err := ioutil.ReadAll(resp.Body)
        if err != nil { return &quot;&quot; }
        return string(contents)
    }

    func downloader() {
        dl_slots = make(chan bool, DL_SLOT_AMOUNT) // Init the download slot semaphore
        content := get_page(BASE_URL)
        links_regexp := regexp.MustCompile(LIST_LINK_REGEXP)
        matches := links_regexp.FindAllStringSubmatch(content, -1)
        for _, match := range matches{
            go serie_dl(match[1], match[2])
        }
    }

I&#39;d like to be able to test `downloader()` without actually getting a page through http - i.e. by mocking either `get_page` (easier since it returns just the page content as a string) or `http.Get()`.

I found [this thread][1] which seems to be about a similar problem. Julian Phillips presents his library, [Withmock][2] as a solution, but I&#39;m unable to get it to work. Here&#39;s the relevant parts of my testing code, which is largely cargo cult code to me, to be honest:

    import (
        &quot;testing&quot;
        &quot;net/http&quot; // mock
        &quot;code.google.com/p/gomock&quot;
    )
    ...
    func TestDownloader (t *testing.T) {
        ctrl := gomock.NewController()
        defer ctrl.Finish()
        http.MOCK().SetController(ctrl)
        http.EXPECT().Get(BASE_URL)
        downloader()
        // The rest to be written
    }

The test output is following:

&gt; ERROR: Failed to install &#39;_et/http&#39;: exit status 1 output: can&#39;t load
&gt; package: package _et/http: found packages http (chunked.go) and main
&gt; (main_mock.go) in  
&gt; /var/folders/z9/ql_yn5h550s6shtb9c5sggj40000gn/T/withmock570825607/path/src/_et/http

Is the Withmock a solution to my testing problem? What should I do to get it to work?


  [1]: https://groups.google.com/forum/#!topic/golang-nuts/6AN1E2CJOxI
  [2]: http://github.com/qur/withmock

Mock functions in Go

I want to create a package in Go with tests and examples for the package as subdirectories to keep the workspace cleaner. Is this possible and if so how? 

All the documentation always puts the testing code in the same place as the other code, is this better in some way or just convention?

Golang tests in sub-directory

Is this example usage of `sync.WaitGroup` correct? It gives the expected result, but I am unsure about the `wg.Add(4)` and the position of `wg.Done()`. Does it make sense to add the four goroutines at once with `wg.Add()`?

http://play.golang.org/p/ecvYHiie0P

    package main
    
    import (
    	&quot;fmt&quot;
    	&quot;sync&quot;
    	&quot;time&quot;
    )
    
    func dosomething(millisecs time.Duration, wg *sync.WaitGroup) {
    	duration := millisecs * time.Millisecond
    	time.Sleep(duration)
    	fmt.Println(&quot;Function in background, duration:&quot;, duration)
    	wg.Done()
    }
    
    func main() {
    	var wg sync.WaitGroup
    	wg.Add(4)
    	go dosomething(200, &amp;wg)
    	go dosomething(400, &amp;wg)
    	go dosomething(150, &amp;wg)
    	go dosomething(600, &amp;wg)
    
    	wg.Wait()
    	fmt.Println(&quot;Done&quot;)
    }

Result (as expected):

    Function in background, duration: 150ms
    Function in background, duration: 200ms
    Function in background, duration: 400ms
    Function in background, duration: 600ms
    Done



Example for sync.WaitGroup correct?

How do you format an array of hash tables with the [Format-Table][1] cmdlet?

**Example:**

    $table = @( @{ColumnA=&quot;Able&quot;;    ColumnB=1},
                @{ColumnA=&quot;Baker&quot;;   ColumnB=2},
                @{ColumnA=&quot;Charlie&quot;; ColumnB=3} )
    $table | Format-Table

**Desired Output:**

    ColumnA                        ColumnB
    ----                           -----
    Able                           1
    Baker                          2
    Charlie                        3

***Actual* Output:**

    Name                           Value
    ----                           -----
    ColumnA                        Able
    ColumnB                        1
    ColumnA                        Baker
    ColumnB                        2
    ColumnA                        Charlie
    ColumnB                        3


  [1]: http://technet.microsoft.com/en-us/library/hh849892.aspx

Format-Table on Array of Hash Tables

I&#39;m looking for a way to auto-format my code in the WebStorm IDE?

How to auto format code in WebStorm?

I am trying to set a variable to equal today&#39;s date.

I looked this up and found a related article:

https://stackoverflow.com/questions/5023788/set-today-date-as-default-value-in-the-model

However, this didn&#39;t particularly answer my question.

I used the suggested:

    dt.date.today
But after 

    import datetime as dt     
    date = dt.date.today
    print date
     &lt;built-in method today of type object at 0x000000001E2658B0&gt;

     Df[&#39;Date&#39;] = date
     

I didn&#39;t get what I actually wanted which as a clean date format of today&#39;s date...in Month/Day/Year.

How can I create a variable of today&#39;s day in order for me to input that variable in a DataFrame?
    


How to set a variable to be &quot;Today&#39;s&quot; date in Python/Pandas

I have an AngularJS application, which collects data from input, transforms a model into a string using `JSON.stringify()` and lets a user edit this model in such a way that input fields get updated if the `&lt;textarea&gt;` element is updated and vice versa. Some kind of two-way binding :)



The problem is that the String itself looks ugly and I would like to format it so it looks like this:

![enter image description here][1]

And not like it looks now:


![enter image description here][2]

Any ideas how this can be accomplished? If you need some additional info - don&#39;t hesitate asking. Every answer is highly appreciated and answered immediately.

Thank you.

P.S. I guess this should be some kind of directive or a custom filter. Data itself SHOULD NOT be changed, only the output.

  [1]: http://i.stack.imgur.com/A1gCv.jpg
  [2]: http://i.stack.imgur.com/GM02z.jpg

AngularJS format JSON string output

I have a date with the format `Sun May 11,2014`. How can I convert it to `2014-05-11` using JavaScript?

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    function taskDate(dateMilli) {
        var d = (new Date(dateMilli) + &#39;&#39;).split(&#39; &#39;);
        d[2] = d[2] + &#39;,&#39;;

        return [d[0], d[1], d[2], d[3]].join(&#39; &#39;);
    }

    var datemilli = Date.parse(&#39;Sun May 11,2014&#39;);
    console.log(taskDate(datemilli));

&lt;!-- end snippet --&gt;

The code above gives me the same date format, `sun may 11,2014`. How can I fix this?




Format JavaScript date as yyyy-mm-dd

I&#39;m using Sublime Text 2 (with the Indent XML plugin) for editing XML files.

How can I configure Sublime Text to automatically execute the &quot;Indent XML&quot; action right after opening a file named *.xml? 


How to indent XML files automatically when opened in Sublime Text 2?

I downloaded some code from the Internet, and the four-space indentation is bugging the crap out of me. I tried to do a find and replace for &quot;&lt;4 spaces&gt;&quot; and replace it with &quot;\t&quot;, but that just replaced all sets of spaces with the string &quot;\t&quot;. How would I put a tab in the &quot;replace&quot; box?


Replace spaces with tabs using Eclipse

I haven&#39;t been able to figure this out yet. Atom seems to use spaces as the default indentation mode. I prefer to have tabs instead though. Sublime Text has built in functionality for switching and converting indentation.

Anyone found out how to change the indentation mode of Atom?

Some screenshots from Sublime Text:

![Sublime Text indentation menu open][1]
![Sublime text indentation menu][2]


  [1]: http://i.stack.imgur.com/IZC1E.png
  [2]: http://i.stack.imgur.com/Fujwp.png

How to change indentation mode in Atom?

This is example of two 4-space indentations
http://i.imgur.com/B2BWYSw.png

But indentation from notepad++ narrower with same number of spaces
How I can change it?

How I can increase tab width in notepad++ (v6.5)?

Given a file in my project, I want to be able to replace all of the tab characters in the file with white spaces. Is there any way to do this in intellij? 

Content Type	Original Author	Original Content on Stackoverflow
Question	Erik Kaplun	View Question on Stackoverflow
Solution 1 - Go	ANisus	View Answer on Stackoverflow
Solution 2 - Go	Intermernet	View Answer on Stackoverflow

Indentation in Go: tabs or spaces?

Go Problem Overview

Go Solutions

Solution 1 - Go

Solution 2 - Go

The command rbenv install is missing

What is the difference between a web API and a web service?

Attributions