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Create singleton using GCD's dispatch_once in Objective-C
...(instancetype)sharedInstance
{
static dispatch_once_t once;
static id sharedInstance;
dispatch_once(&once, ^
{
sharedInstance = [self new];
});
return sharedInstance;
}
+ (Class*)sharedInstance
{
static dispatch_once_t once;
static Class *sharedInst...
Difference between JSONObject and JSONArray
...
When you are working with JSON data in Android, you would use JSONArray to parse JSON which starts with the array brackets. Arrays in JSON are used to organize a collection of related items (Which could be JSON objects).
For example: [{"name":"item 1"},{"name": "item2...
Close Bootstrap Modal
...cluding the 'toggle' at all is superflous. Just make sure not to have a 'hide' class on the modal div. But yes, the typo was causing the issue. so +1
– merv
May 11 '13 at 3:21
...
.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included i
...find it in a folder called conf, config or something along those lines)
Inside the httpd.conf file uncomment the line LoadModule rewrite_module modules/mod_rewrite.so (remove the pound '#' sign from in front of the line)
Also find the line ClearModuleList is uncommented then find and make sure that ...
Javascript : natural sort of alphanumerical strings
...s, it is better to create an Intl.Collator object and use the function provided by its compare property. Docs link
var collator = new Intl.Collator(undefined, {numeric: true, sensitivity: 'base'});
var myArray = ['1_Document', '11_Document', '2_Document'];
console.log(myArray.sort(collator.c...
Maven: best way of linking custom external JAR to my project?
...mpile.
If you are starting with maven I suggest to use maven directly not IDE plugins as it adds an extra layer of complexity.
As for the error, do you put the required jars on your classpath? If you are using types from the library, you need to have access to it in the runtime as well. This has n...
Heroku error: “Permission denied (public key)”
...add <path-to-your-public-key>.
For example, heroku keys:add ~/.ssh/id_rsa.pub
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How to get a DOM Element from a JQuery Selector
...le TypeErrors? A few years ago I used to be an elitist ECMAScripter and avoided frameworks but the more I learned about inconsistencies I ended up relying more. Browser engines are only getting faster and faster, unless the speed is noticeable you shouldn't really worry about this. The entire point ...
How do you represent a graph in Haskell?
...to additional indirection, as you're suggesting; often by using a map from ids to the actual elements, and having elements contain references to the ids instead of to other elements. The main thing I didn't like about doing that (aside from the obvious inefficiency) is that it felt more fragile, int...
Align image in center and middle within div
... margin-left: auto;
margin-right: auto;
display: block;
}
<div id="over" style="position:absolute; width:100%; height:100%">
<img src="http://www.garcard.com/images/garcard_symbol.png">
</div>
JSFiddle
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