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In Objective-C why should I check if self = [super init] is not nil?
...ecause of this it's standard practice to check for nil pretty much all the time, for consistency's sake.
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What is the difference between CMD and ENTRYPOINT in a Dockerfile?
... at all. ENTRYPOINT sets a metadata that can (but can be overridden) at runtime, so if you don't change anything, after starting your container, the result will be the same, however, RUN will be exectuted at build time and no matter what you do at runtime, it will be here.
– cr...
Abstract functions in Swift Language
...Also the subclass still isn't forced to implement the functions at compile time, and you not compelled to implement the protocol either.
– bandejapaisa
Dec 30 '14 at 17:05
5
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Remove blank lines with grep
...tc.
* previous match (whitespace) may exist from 0 to infinite times
$ match end of line
Running the code-
$ echo "
> hello
>
> ok" |
> grep -v "^[[:space:]]*$"
hello
ok
To understand more about how/why this works, I recommend reading up on regular exp...
Why is it said that “HTTP is a stateless protocol”?
...same socket. That is solely a performance thing, intended to minimize the time/bandwidth that'd otherwise be spent reestablishing a connection for each request.
As far as HTTP is concerned, they are all still separate requests and must contain enough information on their own to fulfill the request...
Reset identity seed after deleting records in SQL Server
...'t know why. Can you move it down a line. I copied and pasted this line 50 times and now I have to go back and fix it.
– AnotherDeveloper
Mar 4 '16 at 17:58
5
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Get image data url in JavaScript?
...ase64 version of an image file, they have to request it again (most of the time it will come from cache) but this time as a Blob.
Then you can use a FileReader to read it either as an ArrayBuffer, or as a dataURL.
function toDataURL(url, callback){
var xhr = new XMLHttpRequest();
x...
Auto-expanding layout with Qt-Designer
...
@Michal Kottman: That only works at design time. It will not change the layout when the user resizes the window at run time.
– Jay
Feb 4 '13 at 21:26
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Can scrapy be used to scrape dynamic content from websites that are using AJAX?
...R - these are requests made by javascript code.
Tip: log is cleared every time you load a page, at the bottom of the picture, the black dot button will preserve log.
After analyzing requests and responses you can simulate these requests from your web-crawler and extract valuable data. In many case...
Finding last occurrence of substring in string, replacing that
...ce have to be reversed too. Otherwise when you reverse the string a second time the letters you just inserted will be backwards. You can only use this if you're replacing one letter with one letter, and even then I wouldn't put this in your code incase someone has to change it in the future and st...