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Why is [1,2] + [3,4] = “1,23,4” in JavaScript?
...he way, we can move on to the overview itself.
Different result types of + by operand types
|| undefined | null | boolean | number | string | object |
=========================================================================
undefined || number | number | number | number | string...
Warn user before leaving web page with unsaved changes
...
Short, wrong answer:
You can do this by handling the beforeunload event and returning a non-null string:
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = 'It looks like you have been editing something. '
...
“Could not load type [Namespace].Global” causing me grief
...sensitive about that and for whatever reason it bricks the configuration.
By simply picking a third unaffected port this problem went away because it then maps the port to a new directory mapping (my branches are located differently on disk). I noticed this because I tried to change the type name p...
Is it possible to focus on a using JavaScript focus() function?
...ou can also give a tabindex of -1, which will make the div only focus-able by script, not the user.
document.getElementById('test').onclick = function () {
document.getElementById('scripted').focus();
};
div:focus {
background-color: Aqua;
}
<div>Element X (not focusable)<...
Add swipe to delete UITableViewCell
...ngStyle == UITableViewCellEditingStyle.Delete) {
// handle delete (by removing the data from your array and updating the tableview)
}
}
Swift 3.0:
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableVi...
Advantages and disadvantages of GUID / UUID database keys
...h.
Disadvantages:
Larger space use, but space is cheap(er)
Can't order by ID to get the insert order.
Can look ugly in a URL, but really, WTF are you doing putting a REAL DB key in a URL!? (This point disputed in comments below)
Harder to do manual debugging, but not that hard.
Personally, I u...
How can I send an email by Java application using GMail, Yahoo, or Hotmail?
Is it possible to send an email from my Java application using a GMail account? I have configured my company mail server with Java app to send email, but that's not going to cut it when I distribute the application. Answers with any of using Hotmail, Yahoo or GMail are acceptable.
...
Get pandas.read_csv to read empty values as empty string instead of nan
...Documentation for read_csv now offers both na_values (list or dict indexed by columns) and keep_default_na (bool). The keep_default_na value indicates whether pandas' default NA values should be replaced or appended to. The OP's code doesn't work currently just because it's missing this flag. For th...
CPU Privilege Rings: Why rings 1 and 2 aren't used?
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As a hobbyist operating system writer, I found that because paging (a major part of the modern protection model) only has a concept of privileged (ring 0,1,2) and unprivileged, the benefit to rings 1 and 2 were diminished greatly.
T...
NHibernate vs LINQ to SQL
...about normalizing your database instead, and letting your DAL be generated by tools i.e. SQLMetal?
– Alex
Jul 1 '10 at 19:31
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