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What are the best practices to follow when declaring an array in Javascript?
...9] = "omega"; 1. Arrays in JS are totally dynamic, you can reference any index you would like, and it will just be "undefined". This is just as true as if you were to say: var arr = new Array(10); arr[23]; 2. the array's length is going to be set to the highest value that has anything in it,...
Can't access object property, even though it shows up in a console log
...g)) and you will see the keys, or the state of the object at the time you called console.log.
You will (usually) find the keys are being added after your console.log call.
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How to know if two arrays have the same values
..., i.e. ['a', 'b'] and ['a,b']. I would only recommend this technique for small throwaway scripts.
– alex
Mar 7 '16 at 16:23
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Use '=' or LIKE to compare strings in SQL?
...s used for equality test (as defined by the COLLATION in use).
= can use indexes while LIKE queries usually require testing every single record in the result set to filter it out (unless you are using full text search) so = has better performance.
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Cannot issue data manipulation statements with executeQuery()
...) returns a ResultSet. I'm not as familiar with Java/MySQL, but to create indexes you probably want a executeUpdate().
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What are attributes in .NET?
...ur objects/methods/properties.
For example I might declare an Attribute called: DisplayOrder so I can easily control in what order properties should appear in the UI. I could then append it to a class and write some GUI components that extract the attributes and order the UI elements appropriately...
What does 'synchronized' mean?
...e hoods.
Sources
http://docs.oracle.com/javase/specs/jls/se8/html/index.html
Java® Language Specification, 2015-02-13
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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...功能，所以大部分网页对象（Web page object），如html, htm, php等页面文件，gif,tif, png, bmp等图片文件，以及其他格式的文件，在有效期（TTL）内，对于重复的访问，不必从原始网站重新传送文件实体，只需通过简单的认证（Freshness V...
JavaScript data grid for millions of rows [closed]
... http://github.com/mleibman/SlickGrid
DataTables http://www.datatables.net/index
ShieldUI http://demos.shieldui.com/web/grid-virtualization/performance-1mil-rows
My best 3 options are jqGrid, jqxGrid and DataTables. They can work with thousands of rows and support virtualization.
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Proper use of beginBackgroundTaskWithExpirationHandler
...l need to wrap it in a background task. It's also very important that you call endBackgroundTask when you're finished - otherwise the app will be killed after its allotted time has expired.
Mine tend look something like this:
- (void) doUpdate
{
dispatch_async(dispatch_get_global_queue(DISPAT...