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What's the right way to pass form element state to sibling/parent elements?
... updating the state in the Root component and re-rendering, C2's props are now in sync since the state was updated in the Root component and passed along.
class Example extends React.Component {
constructor (props) {
super(props)
this.state = { data: 'test' }
}
render () {
return ...
Should I use alias or alias_method?
...name” picks the method “full_name” defined in “Developer” class. Now lets try with alias.
class User
def full_name
puts "Johnnie Walker"
end
def self.add_rename
alias name full_name
end
end
class Developer < User
def full_name
puts "Geeky geek"
end
add_rena...
How can I scan barcodes on iOS?
... use an external framework or library. The iOS ecosystem with AVFoundation now fully supports scanning almost every code from QR over EAN to UPC.
Just have a look at the Tech Note and the AVFoundation programming guide. AVMetadataObjectTypeQRCode is your friend.
Here is a nice tutorial which shows...
How to name and retrieve a stash by name in git?
..._stash"
Where "my_stash" is the stash name.
Some more useful things to know: All the stashes are stored in a stack.
Type:
git stash list
This will list down all your stashes.
To apply a stash and remove it from the stash stack, type:
git stash pop stash@{n}
To apply a stash and keep it in ...
Execute code when Django starts ONCE only?
...
Update from Pykler's answer below: Django 1.7 now has a hook for this
Don't do it this way.
You don't want "middleware" for a one-time startup thing.
You want to execute code in the top-level urls.py. That module is imported and executed once.
urls.py
from django...
How do I install PyCrypto on Windows?
...iler and Setuptools 6.0 or later, and most packages with C extensions will now compile readily.
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Loader lock error
...
Wanted to share an update in VS2015, you now need to go to Debug->Windows->Exception Settings. The rest is the same with Managed Debugging Assistants \ LoaderLock
– jxramos
Aug 3 '16 at 19:10
...
The “unexpected ++” error in jslint [duplicate]
...meone comes along and moves the space?
var i = 0, j = 0;
alert(i+ ++j);
Now this first increments j, and then adds i to the new value of j, resulting in 1 being alerted.
This could easily be solved by doing
var i = 0, j = 0;
alert((i++) +j);
Now this cannot be mistaken.
...
OPTION (RECOMPILE) is Always Faster; Why?
...d when you mentioned a query initially run on a table with 10 records, and now the table has millions of records. That was my case exactly. I didn't mention it in the post because I didn't think it mattered. Fascinating stuff. Thanks again.
– Chad Decker
Jan 1 ...
Getting the name of the currently executing method
...at a lot of work has gone into making HotSpot very reliable. You need to know, though, in case you want your code to not rely on the behavior of a specific JVM.
– Thorbjørn Ravn Andersen
Apr 15 '13 at 8:53
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