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Double exclamation points? [duplicate]
... undefined // true
" \t\r\n" == 0 // true
Source: Doug Crockford
Javascript also gets really weird when it comes to NaN values. And this is the only case I can think of off the top of my head where !! would behave differently to ===.
NaN === NaN //false
!!NaN === ...
Token Authentication for RESTful API: should the token be periodically changed?
...rse is up to the server to enforce.
The default TokenAuthentication class does not support this, however you can extend it to achieve this functionality.
For example:
from rest_framework.authentication import TokenAuthentication, get_authorization_header
from rest_framework.exceptions import Aut...
How to combine paths in Java?
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@modosansreves: Look at File.getCanonicalPath.
– Jon Skeet
Oct 8 '13 at 10:54
1
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Remove multiple whitespaces
... He also wants \n and \t to be replaced with space. Now his pattern does not match these, say for $x = "does\nthis\twork"; The OP wants all whitespace to be replaced with a single space.
– codaddict
Feb 24 '10 at 13:17
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Storyboard doesn't contain a view controller with identifier
... below the Storyboard ID in the inspector. Clicking on "Use Storyboard ID" does not seem to be enough.]
There's an image below for reference: (in this instance I've named my identifier the same as my class)
share
...
iOS detect if user is on an iPad
...()
#define IPAD UIUserInterfaceIdiomPad
if ( IDIOM == IPAD ) {
/* do something specifically for iPad. */
} else {
/* do something specifically for iPhone or iPod touch. */
}
Other Examples
if ( [(NSString*)[UIDevice currentDevice].model hasPrefix:@"iPad"] ) {
return YES; /* De...
Is it possible to set async:false to $.getJSON call
...d add a type: 'POST' option to as well to turn it into a post - though you don't want to use async: false unless you really need to - it'll lock up the UI.
– Nick Craver♦
Apr 19 '14 at 12:24
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Understanding dict.copy() - shallow or deep?
While reading up the documentation for dict.copy() , it says that it makes a shallow copy of the dictionary. Same goes for the book I am following (Beazley's Python Reference), which says:
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Basic http file downloading and saving to disk in python?
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A clean way to download a file is:
import urllib
testfile = urllib.URLopener()
testfile.retrieve("http://randomsite.com/file.gz", "file.gz")
This downloads a file from a website and names it file.gz. This is one of my favorite solutions...
What does “abstract over” mean?
...ten in the Scala literature, I encounter the phrase "abstract over", but I don't understand the intent. For example , Martin Odersky writes
...