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Objective-C: Property / instance variable in category
...exactly what you're wanting:
#import <objc/runtime.h>
static void *MyClassResultKey;
@implementation MyClass
- (NSString *)test {
NSString *result = objc_getAssociatedObject(self, &MyClassResultKey);
if (result == nil) {
// do a lot of stuff
result = ...;
objc_setAssocia...
Postgres: clear entire database before re-creating / re-populating from bash script
...
To dump:
pg_dump -Fc mydb > db.dump
To restore:
pg_restore --verbose --clean --no-acl --no-owner -h localhost -U myuser -d my_db db/latest.dump
share
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Efficient way to determine number of digits in an integer
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Probably faster than my answer, well done. For added efficiency, if you know that your input numbers will be mostly small ones (I'm guessing less than 100,000), then reverse the tests: if (x < 10) return 1; if (x < 100) return 2; etc., so t...
How to make a function wait until a callback has been called using node.js
...utine that will handle the resulting value:
function(query, callback) {
myApi.exec('SomeCommand', function(response) {
// other stuff here...
// bla bla..
callback(response); // this will "return" your value to the original caller
});
}
So you dont use it like this:
var returnVal...
Commenting in a Bash script inside a multiline command
...You should be able to put comment lines in between your commands
# output MYSQLDUMP file
cat ${MYSQLDUMP} | \
# simplify the line
sed '/created_at/d' | \
# create some newlines
tr ",;" "\n" | \
# use some sed magic
sed -e 's/[asbi]:[0-9]*[:]*//g' -e '/^[{}]/d' -e 's/""//g' -e '/^"{/d' | \
# more ma...
How to deal with cyclic dependencies in Node.js
... users can belong to many teams. So, it's not that something is wrong with my modeling. Obviously, I could refactor my code to avoid the circular dependency between the two entities, but that would not be the most pure form of the domain model, so I will not do that.
– Alexandr...
Positioning MKMapView to show multiple annotations at once
I've got several annotations I want to add to my MKMapView (it could 0-n items, where n is generally around 5). I can add the annotations fine, but I want to resize the map to fit all annotations onscreen at once, and I'm not sure how to do this.
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Is there a way to break a list into columns?
My webpage has a 'skinny' list: for example, a list of 100 items of one word in length each. To reduce scrolling, I want to present this list in two or even four columns on the page. How should I do this with CSS?
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Maven Install on Mac OS X
...ymlink to yours. I know a lot of people work on stuff with maven 2 still, myself included.
– Michael
Jan 16 '12 at 15:45
3
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how do I use UIScrollView in Interface Builder?
...best piece of advice I've received in a while. I could not figure out why my scroll view didn't work, and didn't find that info about contentSize anywhere else. Thanks.
– Drew C
Feb 17 '10 at 5:23
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