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Computed / calculated / virtual / derived columns in PostgreSQL
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edited Oct 6 '16 at 14:01
answered Dec 13 '15 at 20:06
E...
How does password salt help against a rainbow table attack?
...s you describe), but rainbow tables require a reducing function which transforms a hash back to plaintext, to then be rehashed thousands of times, storing only the initial plaintext and final hash. Searching is computationally longer than hash tables, but 'captures' many plaintexts per hash.
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How to use underscore.js as a template engine?
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In it's simplest form you would use it like:
var html = _.template('<li><%= name %></li>', { name: 'John Smith' });
//html is now '<li>John Smith</li>'
If you're going to be using a template a few times you...
UIButton: Making the hit area larger than the default hit area
... if self.hidden || !self.userInteractionEnabled || self.alpha < 0.01 { return nil }
// increase the hit frame to be at least as big as `minimumHitArea`
let buttonSize = self.bounds.size
let widthToAdd = max(minimumHitArea.width - buttonSize.width, 0)
let hei...
PATH issue with pytest 'ImportError: No module named YadaYadaYada'
...'s has a good article about packaging best practices: blog.habnab.it/blog/2013/07/21/python-packages-and-you, and PEP8 says that "implicit relative imports should never be used and have been removed in Python 3." See: python.org/dev/peps/pep-0008.
– Apteryx
Nov...
Select every Nth element in CSS
...xpression using the n variable in addition to constant numbers. You can perform addition (+), subtraction (-) and coefficient multiplication (an where a is an integer, including positive numbers, negative numbers and zero).
Here's how you would rewrite the above selector list:
div:nth-child(4n)
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When would I use Task.Yield()?
...terations. For example:
async Task DoDialogAsync()
{
var dialog = new Form();
Func<Task> showAsync = async () =>
{
await Task.Yield();
dialog.ShowDialog();
}
var dialogTask = showAsync();
await Task.Yield();
// now we're on the dialog's neste...
In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [dupli
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Wouldn't it produce "10" for byte 0x01?
– n0rd
Oct 20 '09 at 20:21
4
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Java system properties and environment variables
...ed Apr 13 '17 at 7:57
informatik01
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answered Aug 14 '11 at 4:30
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Hour from DateTime? in 24 hours format
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Try this, if your input is string
For example
string input= "13:01";
string[] arry = input.Split(':');
string timeinput = arry[0] + arry[1];
private string Convert24To12HourInEnglish(string timeinput)
{
DateTime startTime = new DateTime(2018, 1, 1, int.Parse(timeinput...