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difference between throw and throw new Exception()
...
throw; rethrows the original exception and preserves its original stack trace.
throw ex; throws the original exception but resets the stack trace, destroying all stack trace information until your catch block.
NEVER write throw ex;
throw new Exception(ex.Message...
Get Slightly Lighter and Darker Color from UIColor
...the brightness property itself. All in all:
@implementation UIColor (LightAndDark)
- (UIColor *)lighterColor
{
CGFloat h, s, b, a;
if ([self getHue:&h saturation:&s brightness:&b alpha:&a])
return [UIColor colorWithHue:h
saturation:s
...
Creating Unicode character from its number
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That's why I said 'below'! And I need to emphasise that, despite the fact that Java chars only go up to 0xffff, Unicode code points go up to 0xfffff. The Unicode standard got changed after Java was designed. These days Java chars technically hold UTF-1...
Where to define custom error types in Ruby and/or Rails?
...ou define exceptions in this way:
gem_dir/lib/gem_name/exceptions.rb
and defined as:
module GemName
class AuthenticationError < StandardError; end
class InvalidUsername < AuthenticationError; end
end
an example of this would be something like this in httparty
For Ruby on Rails
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Iterate over a Javascript associative array in sorted order
...
You cannot iterate over them directly, but you can find all the keys and then just sort them.
var a = new Array();
a['b'] = 1;
a['z'] = 1;
a['a'] = 1;
function keys(obj)
{
var keys = [];
for(var key in obj)
{
if(obj.hasOwnProperty(key))
{
keys.pus...
Unicode character as bullet for list-item in CSS
...probably go for an image background, they're much more efficient versatile and cross-browser-friendly.
Here's an example:
<style type="text/css">
ul {list-style:none;} /* you should use a css reset too... ;) */
ul li {background:url(images/icon_star.gif) no-repeat 0 5px;}
</style>
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How to make phpstorm display line numbers by default?
...ettings (or Preferences if you are on Mac) | Editor | General | Appearance and check Show line numbers.
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Add swipe to delete UITableViewCell
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if (editingStyle == 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
}
overrid...
sql ORDER BY multiple values in specific order?
Ok I have a table with a indexed key and a non indexed field.
I need to find all records with a certain value and return the row.
I would like to know if I can order by multiple values.
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PostgreSQL error 'Could not connect to server: No such file or directory'
...n your postgres directory, probably /usr/local/var/postgres/
remove this and start server.
Check - https://github.com/mperham/lunchy is a great wrapper for launchctl.
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