The equivalent of `NULL` is `nil`, as you already discovered. Note, though, that you don&#39;t generally need to initialize things to `nil` or zero in Go, because by default all variables (including dynamically allocated ones) are set to “zero values” according to type (numbers zero, references `nil`). So in your example saying `new(Node)` would result in a Node with both fields `nil`.

How can I make `git push` to push not only to `origin` but also another remote repository?

as `git push` is only an alias for `git push origin`, can I alias git push to push to 2 remote repositories at once (with just that one command)?

I’m not looking for a non-git script here but would like to set this up for my local repository in git.

When I tried it with post-push scripts I failed.

git push to multiple repositories simultaneously

I&#39;ve been unable to find a workable solution to this problem, despite several similar questions here and elsewhere. It seems likely that this question hasn&#39;t been answered for Rails 3, so here goes:

I have an application that currently allows users to create their own subdomain that contains their instance of the application. While in Rails 2 you were best served using the subdomain-fu gem, in version 3 it&#39;s dramatically simpler, as per the Railscast -- http://railscasts.com/episodes/221-subdomains-in-rails-3.

That&#39;s good stuff, but I also want to provide the option for users to associate their own domain name with their account. So while they might have http://userx.mydomain.com, I&#39;d like them to choose to have http://userx.com associated as well.

I found a few references to doing this in Rails 2, but those techniques don&#39;t appear to work anymore (particularly this one: https://feefighters.com/blog/hosting-multiple-domains-from-a-single-rails-app/). 

Can anyone recommend a way to use routes to accept an arbitrary domain and pass it along to a controller so I can show the appropriate content?

**Update**: I&#39;ve gotten most of an answer now, thanks to Leonid&#39;s timely response, and a fresh look at the code. It ultimately required an addition to the existing Subdomain code that I was using (from the Railscast solution) and then adding a bit to routes.rb. I&#39;m not all the way there yet but I want to post what I have so far.

In lib/subdomain.rb:


    class Subdomain
      def self.matches?(request)
        request.subdomain.present? &amp;&amp; request.subdomain != &quot;www&quot;
      end
    end

    class Domain
      def self.matches?(request)
        request.domain.present? &amp;&amp; request.domain != &quot;mydomain.com&quot;
      end
    end

I&#39;ve added the second class in imitation of the first, which is known working. I simply add a condition that ensures that the incoming domain is not the one for which I&#39;m hosting the main site.

This class is used in routes.rb:

    require &#39;subdomain&#39;
    constraints(Domain) do
      match &#39;/&#39; =&gt; &#39;blogs#show&#39;
    end
  
    constraints(Subdomain) do
      match &#39;/&#39; =&gt; &#39;blogs#show&#39;
    end

Here, I&#39;m prepending the existing subdomain code (again, it&#39;s working fine) with a stanza to check for the Domain. If this server responds to that domain and it&#39;s not the one under which the main site operates, forward to the specified controller.

And while that appears to be working, I don&#39;t quite have the whole thing working yet, but I think this particular problem has been solved.

Rails routing to handle multiple domains on single application

How do you express a &quot;null&quot; value in Go?

    type Node struct { 
    	next *Node
    	data interface{}
    }

And I want to say

    return &amp;Node{ data: NULL, next: NULL }

How do you express a &quot;null&quot; value in Go?

How do you express a "null" value in Go?
<pre><code class="hljs language-go">type Node struct { 
	next *Node
	data interface{}
}
</code></pre>
And I want to say
<pre><code class="hljs language-r">return &#x26;Node{ data: NULL, next: NULL }
</code></pre>

I&#39;m trying to convert a string returned from `flag.Arg(n)` to an `int`. What is the idiomatic way to do this in Go?

Convert string to integer type in Go?

I come from JavaScript which has first class function support. For example you can:

* pass a function as a parameter to another function
* return a function from a function.

Can someone give me an example of how I would do this in Go?

First class functions in Go

Here are the facts:

- the language Go has a garbage collector. 

- Java has a garbage collection

- a lot of Java programs have (subtle or not) memory leaks

As an example of a Java program that has memory leaks (not for the faint of heart, the question may shake your beliefs), see here about a little Java program called Tomcat that even has a &quot;find leaks&quot; button: https://stackoverflow.com/questions/4565105

So I am wondering: will programs written in Go exhibit the same kind of (subtle or not) memory leaks that some programs written in Java exhibit?

Is Go subject to the same subtle memory-leaks that Java is?

I am new to Golang so allocation in it makes me insane:

    import &quot;sync&quot;
    
    type SyncMap struct {
            lock *sync.RWMutex
            hm map[string]string
    }
    func (m *SyncMap) Put (k, v string) {
            m.lock.Lock()
            defer m.lock.Unlock()
    
            m.hm[k] = v, true
    }


and later, I just call:

    sm := new(SyncMap)
    sm.Put(&quot;Test, &quot;Test&quot;)

At this moment I get a nil pointer panic. 

I&#39;ve worked around it by using another one function, and calling it right after `new()`:

    func (m *SyncMap) Init() {
            m.hm = make(map[string]string)
            m.lock = new(sync.RWMutex)
    }

But I wonder, if it&#39;s possible to get rid of this boilerplate initializing?

How to initialize members in Go struct

I&#39;m writing a game in go. In C++ I would store all my entity classes in an array of the BaseEntity class. If an entity needed to move about in the world it would be a PhysEntity which is derived from a BaseEntity, but with added methods. I tried to imitate this is go:

    package main
    
    type Entity interface {
    	a() string
    }
    
    type PhysEntity interface {
    	Entity
    	b() string
    }
    
    type BaseEntity struct { }
    func (e *BaseEntity) a() string { return &quot;Hello &quot; }
    
    type BasePhysEntity struct { BaseEntity }
    func (e *BasePhysEntity) b() string { return &quot; World!&quot; }
    
    func main() {
    	physEnt := PhysEntity(new(BasePhysEntity))
    	entity := Entity(physEnt)
    	print(entity.a())
    	original := PhysEntity(entity)
    // ERROR on line above: cannot convert physEnt (type PhysEntity) to type Entity:
    	println(original.b())
    }

This will not compile as it cant tell that &#39;entity&#39; was a PhysEntity. What is a suitable alternative to this method?


Content Type	Original Author	Original Content on Stackoverflow
Question	fabrizioM	View Question on Stackoverflow
Solution 1 - Go	Arkku	View Answer on Stackoverflow
Solution 2 - Go	fabrizioM	View Answer on Stackoverflow

How do you express a "null" value in Go?

Go Problem Overview

Go Solutions

Solution 1 - Go

Solution 2 - Go

Rails routing to handle multiple domains on single application

git push to multiple repositories simultaneously

Attributions