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Scala constructor overload?
...tor is the sole point of entry to the class.
class Foo(x: Int, y: Int, z: String) {
// default y parameter to 0
def this(x: Int, z: String) = this(x, 0, z)
// default x & y parameters to 0
// calls previous auxiliary constructor which calls the primary constructor
def this(z:...
Insert, on duplicate update in PostgreSQL?
...th "id=3" does not already exist.
You can combine these two into a single string and run them both with a single SQL statement execute from your application. Running them together in a single transaction is highly recommended.
This works very well when run in isolation or on a locked table, but i...
Using jquery to get element's position relative to viewport
...lculates the position of a given element within the viewport
*
* @param {string} obj jQuery object of the dom element to be monitored
* @return {array} An array containing both X and Y positions as a number
* ranging from 0 (under/right of viewport) to 1 (above/left of viewport)
*/
function vis...
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
...tion.
For MySQL < 5.7:
The default root password is blank (i.e. empty string) not root. So you can just login as:
mysql -u root
You should obviously change your root password after installation
mysqladmin -u root password [newpassword]
In most cases you should also set up individual user ...
How to translate between Windows and IANA time zones?
...uget.
Using this library is simple. Here are some examples of conversion:
string tz = TZConvert.IanaToWindows("America/New_York");
// Result: "Eastern Standard Time"
string tz = TZConvert.WindowsToIana("Eastern Standard Time");
// result: "America/New_York"
string tz = TZConvert.WindowsToIana("...
Correct approach to global logging in Golang
...mport (
"log"
"os"
"sync"
)
type logger struct {
filename string
*log.Logger
}
var logger *logger
var once sync.Once
// start loggeando
func GetInstance() *logger {
once.Do(func() {
logger = createLogger("mylogger.log")
})
return logger
}
func createLogger...
Get file size, image width and height before upload
...ileReader API
In case you need images sources as long Base64 encoded data strings
<img src="data:image/png;base64,iVBORw0KGg... ...lF/++TkSuQmCC=">
const EL_browse = document.getElementById('browse');
const EL_preview = document.getElementById('preview');
const readImage = file ...
Generate array of all letters and digits
...36).map{ |i| i.to_s 36 }
(the Integer#to_s method converts a number to a string representing it in a desired numeral system)
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How to pass object with NSNotificationCenter
...cation:(NSNotification*)notification
{
if ([notification.name isEqualToString:@"TestNotification"])
{
NSDictionary* userInfo = notification.userInfo;
NSNumber* total = (NSNumber*)userInfo[@"total"];
NSLog (@"Successfully received test notification! %i", total.intValue...
How to use NSCache
Can someone give an example on how to use NSCache to cache a string?
Or anyone has a link to a good explanation? I can't seem to find any..
...