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What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
...re the same
d = new Array('foo', 'bar'), // c and d are arrays with 2 strings
// these are different:
e = [3] // e.length == 1, e[0] == 3
f = new Array(3), // f.length == 3, f[0] == undefined
;
Another difference is that when using new Array() you're able to set th...
Best practices for in-app database migration for Sqlite
...use prepared statements
sqlite3_exec([self database].sqliteHandle, [[NSString stringWithFormat:@"PRAGMA user_version = %d", DatabaseSchemaVersionLatest] UTF8String], NULL, NULL, NULL);
}
Here's [self database] method that lazily opens the database:
- (FMDatabase *)database {
if (!_databas...
How to unit test an object with database queries
...a, but applies to all OO-languages)
class Database {
public Result query(String query) {... real db here ...}
}
class MockDatabase extends Database {
public Result query(String query) {
return "mock result";
}
}
class ObjectThatUsesDB {
public ObjectThatUsesDB(Database db) {
this....
How to apply multiple styles in WPF
...es, my first approach was to create a constructor that takes any number of strings using the “params” keyword:
public MultiStyleExtension(params string[] inputResourceKeys)
{
}
My goal was to be able to write the inputs as follows:
<Button Style="{local:MultiStyle BigButtonStyle, GreenBut...
Print in one line dynamically
...s about this that may be surprising:
The \r goes at the beginning of the string so that, while the program is running, the cursor will always be after the number. This isn't just cosmetic: some terminal emulators get very confused if you do it the other way around.
If you don't include the last l...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...owever, this method is affected by intermediate-object-creation as summing strings is, right?
– Dr. Jan-Philip Gehrcke
Jan 22 '15 at 21:22
6
...
Convert a Unix timestamp to time in JavaScript
...
@nickf multiplications are trivial on modern CPUs - the string concatenation will require a lot more work!
– Alnitak
Apr 19 '11 at 19:59
30
...
Getting a list of files in a directory with a glob
...u can achieve this pretty easily with the help of NSPredicate, like so:
NSString *bundleRoot = [[NSBundle mainBundle] bundlePath];
NSFileManager *fm = [NSFileManager defaultManager];
NSArray *dirContents = [fm contentsOfDirectoryAtPath:bundleRoot error:nil];
NSPredicate *fltr = [NSPredicate predica...
How to play with Control.Monad.Writer in haskell?
...sk for its type:
ghci> :t logNumber
logNumber :: (Show a, MonadWriter [String] m) => a -> m a
Which tells me that the inferred type is not a function that returns a particular writer, but rather anything that implements the MonadWriter type class. I can now use it:
ghci> let multWith...
Method Syntax in Objective-C
...ersonData) for setting some information about person:
void setPersonData( char* name, int age, float height ) {
and in Objective-C the method would be more descriptive (setPersonName:andAge:andHeight:), like
- (void) setPersonName: (char *)name andAge:(int)age andHeight:(float)height {
...