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What does the question mark operator mean in Ruby?
...:
"F"[0]
or in ruby 1.9:
"F".ord
Also notice that ?F will return the string "F", so in order to make the code shorter, you can also use ?F.ord in Ruby 1.9 to get the same result as "F".ord.
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Remove json element
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Do NOT have trailing commas in your OBJECT (JSON is a string notation)
UPDATE: you need to use array.splice and not delete if you want to remove items from the array in the object
var data = {
"result": [{
"FirstName": "Test1",
"LastName": "User"
}, {
"FirstN...
How to subtract 30 days from the current datetime in mysql?
...ays. This is the most common case.
Note that the date has been added as a string. It is better to add the date in this way, from your calling code, than to use the NOW() function as it kills your caching.
SELECT * FROM table WHERE exec_datetime >= DATE_SUB('2012-06-12', INTERVAL 30 DAY);
You ...
PHP: How to use array_filter() to filter array keys?
...ainst the key, e.g. $allowed could contain regex patterns instead of plain strings.
You can also use ARRAY_FILTER_USE_BOTH to have both the value and the key passed to your filter function. Here's a contrived example based upon the first, but note that I'd not recommend encoding filtering rules usi...
Java: Multiple class declarations in one file
... System.out.println("Fun mathod");
}
public static void main(String[] args) {
Fun fu = new Fun();
fu.fun();
Fen fe = new Fen();
fe.fen();
Fin fi = new Fin();
fi.fin();
Fon fo = new Fon();
fo.fon();
Fan fa = new Fan...
async/await - when to return a Task vs void?
...class Program {
static bool isFinished = false;
static void Main(string[] args) {
// Kick off the background operation and don't care about when it completes
BackgroundWork();
Console.WriteLine("Press enter when you're ready to stop the background operation.");
...
Pure JavaScript equivalent of jQuery's $.ready() - how to call a function when the page/DOM is ready
... that we are checking the document.readyState property. If it contains the string in (as in uninitialized and loading, the first two DOM ready states out of 5) we set a timeout and check again. Otherwise, we execute the passed function.
And here's the jsFiddle for the trick which works across all b...
How can I open a cmd window in a specific location?
... clean prompt without the initial cd command shown? Append &cls to the string like so: cmd.exe /K "cd /d H:\Python\&cls" (documentation) And save this line into a jumpstart.bat file for easy access by just double clicking it.
– Christiaan Westerbeek
Ju...
How to use ELMAH to manually log errors
...mah
/// </summary>
public static void LogError(Exception ex, string contextualMessage=null)
{
try
{
// log error to Elmah
if (contextualMessage != null)
{
// log exception with contextual information that's visibl...
Android Endless List
...f="@+id/progressBar1"
android:padding="5dp"
android:text="@string/loading_text" />
</RelativeLayout>
(optional) Finally, remove that loading indicator by calling listView.removeFooterView(yourFooterView) if there are no more items or pages.
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