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How to find where gem files are installed
... repository
list Display gems whose name starts with STRING
lock Generate a lockdown list of gems
mirror Mirror all gem files (requires rubygems-mirror)
outdated Display all gems that need updates
owner ...
Swapping column values in MySQL
...
Ok, so just for fun, you could do this! (assuming you're swapping string values)
mysql> select * from swapper;
+------+------+
| foo | bar |
+------+------+
| 6 | 1 |
| 5 | 2 |
| 4 | 3 |
+------+------+
3 rows in set (0.00 sec)
mysql> update swapper set
-...
How to call function of one php file from another php file and pass parameters to it?
...all.
See an example below,
File1.php :
<?php
function first($int, $string){ //function parameters, two variables.
return $string; //returns the second argument passed into the function
}
?>
Now Using include (http://php.net/include) to include the File1.php to make its content av...
Why does parseInt yield NaN with Array#map?
...uess octal, which tended to be problematic. It will still guess hex if the string starts with 0x.)
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Fetch first element which matches criteria
... */)
.findFirst()
.get();
An example:
public static void main(String[] args) {
class Stop {
private final String stationName;
private final int passengerCount;
Stop(final String stationName, final int passengerCount) {
this.stationName = st...
differences in application/json and application/x-www-form-urlencoded
...e=ferret&color=purple
The content of the fields is encoded as a query string. The application/x-www-form-
urlencoded's name come from the previous url query parameter but the query parameters is
in where the body of request instead of url.
The whole form data is sent as a long query string.T...
File path to resource in our war/WEB-INF folder?
... .war file), you can use this API:
ServletContext context = getContext();
String fullPath = context.getRealPath("/WEB-INF/test/foo.txt");
http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletContext.html#getRealPath(java.lang.String)
That will get you the full system path to t...
Logging errors in ASP.NET MVC
...rContext)
{
// You could use any logging approach here
StringBuilder builder = new StringBuilder();
builder
.AppendLine("----------")
.AppendLine(DateTime.Now.ToString())
.AppendFormat("Source:\t{0}", filterContext.Exception.Source)
...
Delegates in swift?
...e:class {
func myVCDidFinish(_ controller: FooTwoViewController, text: String)
}
Step2: Declare the delegate in the sending class (i.e. UIViewcontroller)
class FooTwoViewController: UIViewController {
weak var delegate: FooTwoViewControllerDelegate?
[snip...]
}
Step3: Use the dele...
RSA Public Key format
...
The "ssh-rsa" key format has the following specific encoding:
string "ssh-rsa"
mpint e
mpint n
For example, at the beginning, you get 00 00 00 07 73 73 68 2d 72 73 61. The first four bytes (00 00 00 07) give you the length. The rest is the string itself: 73=s, ...