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Java Class that implements Map and keeps insertion order?
...expects a predictable sort order, as opposed to a specific sort order, consider using the interfaces these two classes implement, NavigableMap or SortedMap. This will allow you not to leak specific implementations into your API and switch to either of those specific classes or a completely different...
Firefox session cookies
...hen given a cookie that has no expiration period, modern browsers will consider this cookie to be a 'session cookie', they will remove the cookie at the end of the browsing session (generally when the browser instance closes).
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How to correctly save instance state of Fragments in back stack?
... should do the following:
1. In the fragment, save instance state by overriding onSaveInstanceState() and restore in onActivityCreated():
class MyFragment extends Fragment {
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceS...
What is the colon operator in Ruby?
...bols have the distinct feature that any two symbols named the same will be identical:
"foo".equal? "foo" # false
:foo.equal? :foo # true
This makes comparing two symbols really fast (since only a pointer comparison is involved, as opposed to comparing all the characters like you would in a st...
await vs Task.Wait - Deadlock?
... edited Feb 13 at 11:40
David Ferenczy Rogožan
16.7k88 gold badges6262 silver badges6363 bronze badges
answered Dec 6 '18 at 13:52
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Is there an “exists” function for jQuery?
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@abhirathore2006 If you use an id selector and the element doesn't exist then length is 0 and doesn't throw exceptions.
– Robert
Jun 29 '17 at 20:35
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Transparent ARGB hex value
...doing alpha*255 then round then to hex. Here's a quick converter http://jsfiddle.net/8ajxdLap/4/
function rgb2hex(rgb) {
var rgbm = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?((?:[0-9]*[.])?[0-9]+)[\s+]?\)/i);
if (rgbm && rgbm.length === 5...
PDO's query vs execute
... standard SQL statement and requires you to properly escape all data to avoid SQL Injections and other issues.
execute runs a prepared statement which allows you to bind parameters to avoid the need to escape or quote the parameters. execute will also perform better if you are repeating a query mul...
Error while pull from git - insufficient permission for adding an object to repository database .git
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Assuming @ChrisHayes is right about an accidental sudo, this should fix it. From inside your repository:
sudo chown -R $USER:$USER "$(git rev-parse --show-toplevel)/.git"
Update: for those of you getting the illegal group name error, try this instead:
sudo chown ...
Dynamic SQL - EXEC(@SQL) versus EXEC SP_EXECUTESQL(@SQL)
...mote query plan reuse. When using sp_executesql, parameters are explicitly identified in the calling signature. This excellent article descibes this process.
The oft cited reference for many aspects of dynamic sql is Erland Sommarskog's must read: "The Curse and Blessings of Dynamic SQL".
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