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How to export a Vagrant virtual machine to transfer it
...
You have two ways to do this, I'll call it dirty way and clean way:
1. The dirty way
Create a box from your current virtual environment, using vagrant package command:
http://docs.vagrantup.com/v2/cli/package.html
Then copy the box to the other pc, add it ...
Creating multiline strings in JavaScript
... @Nate It is specified in ECMA-262 5th Edition section 7.8.4 and called LineContinuation : "A line terminator character cannot appear in a string literal, except as part of a LineContinuation to produce the empty character sequence. The correct way to cause a line terminator character to b...
Difference between e.target and e.currentTarget
...E_OVER, onOver);
// btns = the thing before the dot of an addEventListener call
function onOver(e:MouseEvent):void{
trace(e.target.name, e.currentTarget.name);
}
e.target will be one of the 10 buttons and e.currentTarget will always be the "btns" clip.
It's worth noting that if you changed the ...
Django - how to create a file and save it to a model's FileField?
...ld and FieldFile in the Django docs, and especially FieldFile.save().
Basically, a field declared as a FileField, when accessed, gives you an instance of class FieldFile, which gives you several methods to interact with the underlying file. So, what you need to do is:
self.license_file.save(new_na...
JavaScript DOM remove element
...re's a slightly more succinct way of removing an element from the DOM than calling .removeChild(element) on its parent, which is to just call element.remove(). In due course, this will probably become the standard and idiomatic way of removing an element from the DOM.
The .remove() method was added...
Accessing member of base class
...ic name in the constructor definition does this for you.
You don't need to call super(name) from the specialised classes.
Using this.name works.
Notes on use of super.
This is covered in more detail in section 4.9.2 of the language specification.
The behaviour of the classes inheriting from Anim...
What is the difference between include and extend in Ruby?
...nts to the target's metaclass (i.e. the singleton class)
e.g.
if you call Klazz.extend(Mod), now Klazz has Mod's methods (as class methods)
if you call obj.extend(Mod), now obj has Mod's methods (as instance methods), but no other instance of of obj.class has those methods added.
extend is a p...
Need to understand the usage of SemaphoreSlim
...hat there won't be more than 10 workers doing this work at the same time.
Calling WaitAsync on the semaphore produces a task that will be completed when that thread has been given "access" to that token. await-ing that task lets the program continue execution when it is "allowed" to do so. Having...
What is the effect of extern “C” in C++?
... C compiler does not use mangling which c++'s does. So if you want call a c interface from a c++ program, you have to clearly declared that the c interface as "extern c".
– Sam Liao
Jun 25 '09 at 2:28
...
How do you Force Garbage Collection from the Shell?
...n java.lang:type=Memory
#bean is set to java.lang:type=Memory
$>run gc
#calling operation gc of mbean java.lang:type=Memory
#operation returns:
null
$>quit
#bye
Look at the docs on the jmxterm web site for information about embedding this in bash/perl/ruby/other scripts. I've used popen2 in...