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Handling optional parameters in javascript
...nts[2];
}
//...
}
If you are interested, give a look to this article by John Resig, about a technique to simulate method overloading on JavaScript.
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Nested attributes unpermitted parameters
...ibutes: [:id, :name, :category])
Some more details can be found in the Ruby edge API docs and strong_parameters on github or here
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.NET unique object identifier
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A book on .NET by a highly respected author states that RuntimeHelpers.GetHashCode() will produce a code that is unique within an AppDomain, and that Microsoft could have named the method GetUniqueObjectID. This is simply wrong. In testin...
Database development mistakes made by application developers [closed]
What are common database development mistakes made by application developers?
40 Answers
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How to 'insert if not exists' in MySQL?
I started by googling, and found this article which talks about mutex tables.
10 Answers
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How to decorate a class?
...recurse infinitely, because the name Foo is bound to the subclass returned by the decorator, not the original class (which is not accessible by any name). Python 3's argumentless super() avoids this issue (I assume via the same compiler magic that allows it to work at all). You can also work around ...
实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
..._shared_dict config 1m;
server {
location /push {
content_by_lua '
local id = 0;
local ttl = 100;
local now = ngx.time();
local config = ngx.shared.config;
if not config:get("id") then
config:s...
ARC and bridged cast
...FTypeRef while transferring it over to ARC. This could also be represented by id someObj = (__bridge <NSType>) op; CFRelease(op);
(__bridge_retained <CFType>) op or alternatively CFBridgingRetain(op) is used to hand an NSObject over to CF-land while giving it a +1 retain count. You shoul...
MySQL, better to insert NULL or empty string?
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By using NULL you can distinguish between "put no data" and "put empty data".
Some more differences:
A LENGTH of NULL is NULL, a LENGTH of an empty string is 0.
NULLs are sorted before the empty strings.
COUNT(message) wil...
SQL Server SELECT LAST N Rows
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You can do it by using the ROW NUMBER BY PARTITION Feature also. A great example can be found here:
I am using the Orders table of the Northwind database... Now let us retrieve the Last 5 orders placed by Employee 5:
SELECT ORDERID, C...