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How to check if a json key exists?
...p://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)
Returns true if this object has a mapping for name. The mapping may be NULL.
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How can I sort arrays and data in PHP?
...ray $b) {
return someFunction($a['baz']) - someFunction($b['baz']);
}
Strings
A shortcut for the first string comparison version:
function cmp(array $a, array $b) {
return strcmp($a['foo'], $b['foo']);
}
strcmp does exactly what's expected of cmp here, it returns -1, 0 or 1.
Spaceship oper...
How to find nth occurrence of character in a string?
...
If your project already depends on Apache Commons you can use StringUtils.ordinalIndexOf, otherwise, here's an implementation:
public static int ordinalIndexOf(String str, String substr, int n) {
int pos = str.indexOf(substr);
while (--n > 0 && pos != -1)
pos...
Custom numeric format string to always display the sign
Is there any way I can specify a standard or custom numeric format string to always output the sign, be it +ve or -ve (although what it should do for zero, I'm not sure!)
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What version of javac built my jar?
...ersion the class has been compiled FOR, not what version compiled it. Java allows you to compile code so that they're compatible with earlier versions of Java. However, this only applies to byte code and format. It will happily compile code that references JDK 6 libraries into a JDK 5 format, for ex...
Fit background image to div
...his attributes:
background-size: contain;
background-repeat: no-repeat;
and you code is then like this:
<div style="text-align:center;background-image: url(/media/img_1_bg.jpg); background-size: contain;
background-repeat: no-repeat;" id="mainpage">
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Where to put view-specific javascript files in an ASP.NET MVC application?
... class JavaScriptActionDescriptor : ActionDescriptor
{
private string actionName;
private ControllerDescriptor controllerDescriptor;
public JavaScriptActionDescriptor(string actionName, ControllerDescriptor controllerDescriptor)
{
this.actionName = ac...
How to reduce iOS AVPlayer start delay
Note, for the below question: All assets are local on the device -- no network streaming is taking place. The videos contain audio tracks.
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Routing: The current request for action […] is ambiguous between the following action methods
...tional
});
... and in the controller...
public ActionResult Browse(string id)
{
var summaries = /* search using id as search term */
return View(summaries);
}
public ActionResult StartBrowse()
{
var summaries = /* default list when nothing entered */
return View(summaries);
...
How to convert local time string to UTC?
How do I convert a datetime string in local time to a string in UTC time ?
21 Answers
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