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Difference between objectForKey and valueForKey?
...ndexes, it uses keys to differentiate between items. A key is an arbitrary string you provide. No two objects can have the same key (just as no two objects in an NSArray can have the same index).
valueForKey: is a KVC method. It works with ANY class. valueForKey: allows you to access a property us...
mysqli or PDO - what are the pros and cons? [closed]
...ethod automatically adds the enclosing quotes, whereas mysqli::real_escape_string() (and similars) don't:
PDO::quote() places quotes around the input string (if required) and
escapes special characters within the input string, using a quoting
style appropriate to the underlying driver.
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What is the difference between atan and atan2 in C++?
...ple values is (-pi,pi] but atan2 has the range [-pi,pi] so it includes one extra value -pi from another branch due to atan2(-0.0,x) for x<0.
– Z boson
Jul 2 '15 at 11:27
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How can I add a column that doesn't allow nulls in a Postgresql database?
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Or, create a new table as temp with the extra column, copy the data to this new table while manipulating it as necessary to fill the non-nullable new column, and then swap the table via a two-step name change.
Yes, it is more complicated, but you may need to do it...
Including an anchor tag in an ASP.NET MVC Html.ActionLink
... object with a custom method which includes a simple way to add a fragment string.
– LorenzCK
Feb 3 '12 at 14:03
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input type=“text” vs input type=“search” in HTML5
...x in iTunes or some other app). Currently, it's there so that YOU can add extra functionality/presentation by knowing it's a search box.
– Norguard
Jul 21 '12 at 15:07
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Markdown `native` text alignment
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For Markdown Extra you can use custom attributes:
# Example text {style=text-align:center}
How to use if statements in underscore.js templates?
...coming of the technique proposed in this answer is that you're stuck doing string interpolation all over again, which templates are supposed to solve for you. As of right now, _.template inserts a ; at the start of each compiled code tag. Thus, it can handle tags breaking between statements, but not...
How to overload functions in javascript?
... key value
obj.data("key");
If the first argument passed to .data() is a string and the second argument is undefined, then the caller must be using this form.
// set the value associated with a particular key
obj.data("key", value);
If the second argument is not undefined, then set the value ...
Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...= [UIImage imageNamed:@"placeholder.png"];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://myurl.com/%@.jpg", self.myJson[indexPath.row][@"movieId"]]];
NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable da...