[Try this][1]

    package main
    
    import &quot;fmt&quot;
    import &quot;strconv&quot;
    
    func FloatToString(input_num float64) string {
       	// to convert a float number to a string
    	return strconv.FormatFloat(input_num, &#39;f&#39;, 6, 64)
    }
    
    func main() {
    	fmt.Println(FloatToString(21312421.213123))
    }

If you just want as many digits precision as possible, then the special precision -1 uses the smallest number of digits necessary such that ParseFloat will return f exactly. Eg

    strconv.FormatFloat(input_num, &#39;f&#39;, -1, 64)

Personally I find `fmt` easier to use.  ([Playground link][2])

    fmt.Printf(&quot;x = %.6f\n&quot;, 21312421.213123)

Or if you just want to convert the string

    fmt.Sprintf(&quot;%.6f&quot;, 21312421.213123)


  [1]: http://play.golang.org/p/xv7-YGF_cf
  [2]: http://play.golang.org/p/_IbJZZVlyl

I have an ASP.Net MVC 4 app and am using the Url.Action helper like this: `@Url.Action(&quot;Information&quot;, &quot;Admin&quot;)`

This page is used for both adding a new and edit an admin profile. The URLs are as follows:

     Adding a new:       http://localhost:4935/Admin/Information
     Editing Existing:   http://localhost:4935/Admin/Information/5 &lt;==Admin ID

When I&#39;m in the `Editing Existing` section of the site and decide that I would like to add a new admin I click on the following link:  

     &lt;a href=&quot;@Url.Action(&quot;Information&quot;, &quot;Admin&quot;)&quot;&gt;Add an Admin&lt;/a&gt;

The problem however that the above link is actually going to `http://localhost:4935/Admin/Information/5`. This only happens when I&#39;m in that page editing an existing admin. Anywhere else on the site it links correctly to `http://localhost:4935/Admin/Information`

Has anyone else seen this?

**UPDATE:** 

RouteConfig:

            routes.MapRoute(
                name: &quot;Default&quot;,
                url: &quot;{controller}/{action}/{id}&quot;,
                defaults: new { controller = &quot;Home&quot;, action = &quot;Index&quot;, id = UrlParameter.Optional }
            );    

URL.Action() including route values

I have this array. How do I use underscore &#39;_.sortBy&#39; to sort it according to start date?

     
    [
        { 
            id: &#39;oljw832021kjnb389xzll323jk&#39;,
            start: { dateTime: &#39;2013-09-26T13:30:00-07:00&#39; },
            end: { dateTime: &#39;2013-09-26T14:30:00-07:00&#39; },
        },
        { 
            id: &#39;ed7l5tmckdp0lm90nvr4is3d4c&#39;,
            start: { dateTime: &#39;2013-09-26T15:30:00-07:00&#39; },
            end: { dateTime: &#39;2013-09-26T16:30:00-07:00&#39; },
        },
        { 
            id: &#39;etmasdsackdp0kjl0nvrkopioqw&#39;,
            start: { dateTime: &#39;2013-09-26T18:00:00-07:00&#39; },
            end: { dateTime: &#39;2013-09-26T19:00:00-07:00&#39; },
        }
    ]


Array with object sorting with Underscore sortBy

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

<a href="http://golang.org/pkg/strconv/" target="_blank" rel="noopener noreferrer">http://golang.org/pkg/strconv/</a>
<a href="http://play.golang.org/p/4VNRgW8WoB" target="_blank" rel="noopener noreferrer">http://play.golang.org/p/4VNRgW8WoB</a>
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 "21312421.213123"
<pre><code class="hljs language-go">package main

import "fmt"
import "strconv"

func floattostr(input_num float64) string {

 	// to convert a float number to a string
 return strconv.FormatFloat(input_num, 'g', 1, 64)
 }

 func main() {
 fmt.Println(floattostr(21312421.213123))
 // what I expect is "21312421.213123" in string format
 }
</code></pre>
Please help me get the string out of float number. Thanks

    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 I convert an integer value to `float64` type?

I tried

    float(integer_value)

But this does not work. And can&#39;t find any package that does this on [Golang.org][1]

How do I get `float64` values from integer values?


  [1]: https://golang.org/

Content Type	Original Author	Original Content on Stackoverflow
Question	user2671513	View Question on Stackoverflow
Solution 1 - Go	Nick Craig-Wood	View Answer on Stackoverflow

formatFloat : convert float number to string

Go Problem Overview

Go Solutions

Solution 1 - Go

Array with object sorting with Underscore sortBy

URL.Action() including route values

Attributions