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valueOf() vs. toString() in Javascript
...operands, and then decides if addition or concatenation should be applied, based on the type of each primitive.
So, this is how you think it works
a + b:
pa = ToPrimitive(a)
if(pa is string)
return concat(pa, ToString(b))
else
return add(pa, ToNumber(b))
and this is wha...
What is the purpose of the -m switch?
...ause its package will be loaded along the way. 3) Absolute imports will be based on your current directory, not the directory where the .py file is ('' is at the head of sys.path, rather than /path/to/my, if the script is at /path/to/my/script.py).
– clacke
Sep...
Show pending migrations in rails
...migrations:
20090828200602 Test
Run "rake db:migrate" to update your database then try again.
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Deleting folders in python recursively
...t for the next guy searching for a micropython solution, this works purely based on os (listdir, remove, rmdir). It is neither complete (especially in errorhandling) nor fancy, it will however work in most circumstances.
def deltree(target):
print("deltree", target)
for d in os.listdir(targ...
Git for beginners: The definitive practical guide
... using git to track that project). Simply remove the .git directory at the base level of the repository.
cd ~/code/project001/
rm -rf .git/
Caution: This will destroy all revision history, all your tags, everything git has done. It will not touch the "current" files (the files you can currently see...
Passing Parameters JavaFX FXML
...cts into the FXMLLoader constructor, instead you:
Construct an FXMLLoader based upon fxml markup at a specified location
Get a controller from the FXMLLoader instance.
Invoke methods on the retrieved controller to provide the controller with references to the domain objects.
This blog (by another ...
What are transparent comparators?
... of the N3657 proposal (which was a last-minute revision by myself and STL based on N3465 and a later unpublished draft by Joaquín) was to add the is_transparent type as the protocol that can be used to opt in to the new functionality.
If you don't use a "transparent functor" (i.e. one that define...
How to get the response of XMLHttpRequest?
...est with pure JavaScript. You can set custom header but it's optional used based on requirement.
1. Using POST Method:
window.onload = function(){
var request = new XMLHttpRequest();
var params = "UID=CORS&name=CORS";
request.onreadystatechange = function() {
if (this.read...
How to upgrade rubygems
...
you command doesn't work on distribution based on debian gem update --system "2.1.0" ERROR: While executing gem ... (RuntimeError) gem update --system is disabled on Debian, because it will overwrite the content of the rubygems Debian package, and might break your D...
Freeing up a TCP/IP port?
...ou :-).
What are you actually trying to achieve here? Solutions will vary based on the processes holding those ports.
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