- Map (implementing a dictionary - Map can be emulated in ES5 but with worse performance)
- WeakMap / WeakSet
- Proxy ('operator overloading')
- Symbol.toPrimitive
- Tail Call Optimization / Tail Recursion
Tuesday, October 04, 2016
Dan Shappir: Things You Can Do In ES6 That Can't Be Done In ES5
Tuesday, June 02, 2015
SQLWorkbrenchJ memorianoveles
A default memoria 512MB, de meg lehet novelni. Az /Applications/SQLWorkbenchJ.app/Contents/Info.plist-ben kell atirni a
-Xmx512m
sort mondjuk erre:
-Xmx4096m
vagy erre:
-Xmx8192m
sort mondjuk erre:
vagy erre:
Wednesday, November 26, 2014
Object.keys()
The
src
And this is how you iterate the keys of an array:
Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).src
And this is how you iterate the keys of an array:
Object.keys(myArray).forEach(function (key) {
// do something with obj[key]
});Sunday, November 24, 2013
Flexbox justify-content vs align-items
Csak emlekeztetonek, nehogy megint elrontsam:
main axis: justify-content es ennek megfeleloen -webkit-justify-content
cross axis: align-items es ennek megfeleloen webkit-align-items
main axis: justify-content es ennek megfeleloen -webkit-justify-content
cross axis: align-items es ennek megfeleloen webkit-align-items
Tuesday, November 19, 2013
JQuery .on() event handler hasznalat a click() helyett dinamikusan letrehozott elemeknel
A click() event handler nem fog mukodni dinaikusan letrehozott elemeknel csak ha a letrehozas utan ujra rakotjuk. Az on() event handler-nel meg lehet adni egy selector-t, tehat ha a $(document).ready()-ben irjuk le az on()-t egy ott mar letezo container item-re amibe bekerul majd dinamikusan a valojaban vizsgalando item akkor minden renben lesz.
<html>
<button id="add">Add new</button>
<div id="container">
<button class="alert">alert!</button>
</div>
</html>
$("div#container").on('click', 'button.alert', function() {
alert(1);
});
Sunday, October 13, 2013
Friday, April 05, 2013
Wednesday, April 03, 2013
Friday, March 08, 2013
SQL datetime & UTC
A datetime nem tárol DateTimeKind-ot ezert jobb megoldás lehet a datetimeoffset, de ha ez nem megoldható viszont tudjuk a Kind-ot (itt UTC) akkor miután kiolvastuk a DateTime-ot az SQLDataReader-rel annak kétféleképpen is megadhatjuk a típusát:
- DateTime unspecified = reader.GetDateTime(index);
DateTime d = new DateTime(unspecified.Ticks, DateTimeKind.UTC); - DateTime unspecified = reader.GetDateTime(index);
DateTime d2= DateTime.SpecifyKind(unspecified, DateTimeKind.UTC);
Persze jobb ezt egy extensionbe tenni:
public static class SqlDataReaderExtensions {
public static DateTime GetDateTimeUtc(this SqlDataReader reader, int columnOrdinal) {
DateTime dt = new DateTime(reader.GetDateTime(0).Ticks, DateTimeKind.Utc);
return dt;
}
}
és utána ezt használni:
DateTime d = reader.GetDateTimeUTC(index);
Monday, October 08, 2012
Monday, July 16, 2012
ASP.NET Routing
Itt van a hivatalos leiras amibol kihagytak a parameter passzolast, de arra is van megoldas.
Friday, May 18, 2012
Show Current File in Project View
Visual Studio > Ctrl + Alt + L (Show in Solution Explorer)
Eclipse > Alt + Shift + w (Show in)
IntelliJ IDEA > Alt + F1 (Select current file or symbol in any view)
innen
Eclipse > Alt + Shift + w (Show in)
IntelliJ IDEA > Alt + F1 (Select current file or symbol in any view)
innen
Monday, April 16, 2012
Web Browser Control rendering mode
Mivel default-bol nem a legfrissebb IE szerint renderel a windowsos web browser control, ezert ha azt szeretnenk, hogy adott oldalt megis ugy renderelje akkor ezt kell megadni:
Monday, March 12, 2012
[Android]__FUNCTION__ java-ban logolashoz
Innen es innen meritve egy sajat loggolo class-ban lehet valami ilyesmi:
public static void LogD(String tag, String msg) {
StackTraceElement ste = new Throwable().getStackTrace()[1];
String s = "[" + ste.getClassName() + "." + ste.getMethodName() + "(" + ste.getLineNumber() + ")] " ;
Log.d(tag, s + msg);
}
public static void LogD(String tag, String msg) {
StackTraceElement ste = new Throwable().getStackTrace()[1];
String s = "[" + ste.getClassName() + "." + ste.getMethodName() + "(" + ste.getLineNumber() + ")] " ;
Log.d(tag, s + msg);
}
Saturday, February 25, 2012
Thursday, February 02, 2012
Thursday, December 15, 2011
Nem latta az Eclipse a Nexus S-t
Csak emlekeztetonek:
Hiaba ment fel USB Driver-bol a 4-es meg igy sem latta az Eclipse a Nexus S-t, mert efelejtettem vegigcsinalni a Driver installalast. Pedig itt le van irva rendesen.
Thursday, October 27, 2011
urllib2 POST progress
Innen.
It is possible but you need to do a few things:
- Fake out the urllib2 subsystem into passing a file handle down to httplib by attaching a
__len__attribute which makeslen(data)return the correct size, used to populate the Content-Length header. - Override the
read()method on your file handle: as httplib callsread()your callback will be invoked, letting you calculate the percentage and update your progress bar.
This could work with any file-like object, but I've wrapped file to show how it could work with a really large file streamed from disk:
import os, urllib2
from cStringIO import StringIO
class Progress(object):
def __init__(self):
self._seen = 0.0
def update(self, total, size, name):
self._seen += size
pct = (self._seen / total) * 100.0
print '%s progress: %.2f' % (name, pct)
class file_with_callback(file):
def __init__(self, path, mode, callback, *args):
file.__init__(self, path, mode)
self.seek(0, os.SEEK_END)
self._total = self.tell()
self.seek(0)
self._callback = callback
self._args = args
def __len__(self):
return self._total
def read(self, size):
data = file.read(self, size)
self._callback(self._total, len(data), *self._args)
return data
path = 'large_file.txt'
progress = Progress()
stream = file_with_callback(path, 'rb', progress.update, path)
req = urllib2.Request(url, stream)
res = urllib2.urlopen(req)
Output:
large_file.txt progress: 0.68
large_file.txt progress: 1.36
large_file.txt progress: 2.04
large_file.txt progress: 2.72
large_file.txt progress: 3.40
...
large_file.txt progress: 99.20
large_file.txt progress: 99.87
large_file.txt progress: 100.00
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