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Design Patterns: Factory vs Factory method vs Abstract Factory
...family of objects that need to be of "the same kind", and have some common base classes. Here's a vaguely fruit-related example. The use case here is that we want to make sure that we don't accidentally use an OrangePicker on an Apple. As long at we get our Fruit and Picker from the same factory, th...
Short form for Java if statement
... a;
}
else {
max = b;
}
Setting a single variable to one of two states based on a single condition is such a common use of if-else that a shortcut has been devised for it, the conditional operator, ?:. Using the conditional operator you can rewrite the above example in a single line like this:
...
Two single-column indexes vs one two-column index in MySQL?
...nation of giver_id and recipient_id. Mind that index criteria is leftmost based - a query referring to only recipient_id would not be able to use the covering index in the statement I provided.
Additionally, MySQL can only use one index per SELECT so a covering index would be the best means of opt...
Should a Netflix or Twitter-style web service use REST or SOAP? [closed]
.... Hell, us devs already know how to do that, we have been dealing with databases for years that have tables and columns and SQL statements that have SELECT, INSERT, UPDATE and DELETE. It should have been a piece of cake.
There are other parts of REST that some people discuss, such as self-descripti...
What is the difference between a pseudo-class and a pseudo-element in CSS?
...description
The pseudo-class concept is introduced to permit selection based on information that lies outside of the document tree or that cannot be expressed using the other simple selectors.
A pseudo-class always consists of a "colon" (:) followed by the name of the pseudo-class and optio...
adding noise to a signal in python
...ance .
When modeling this in python, you can either
1. Calculate variance based on a desired SNR and a set of existing measurements, which would work if you expect your measurements to have fairly consistent amplitude values.
2. Alternatively, you could set noise power to a known level to match som...
Web安全测试之XSS - 更多技术 - 清泛网 - 专注C/C++及内核技术
...具, 点击Toolbar上的"TextWizard" 按钮
XSS 攻击场景
1. Dom-Based XSS 漏洞 攻击过程如下
Tom 发现了Victim.com中的一个页面有XSS漏洞，
例如: http://victim.com/search.asp?term=apple
服务器中Search.asp 页面的代码大概如下
<html>
<title></titl...
Maven project.build.directory
...t;project>
...
<build>
<directory>${project.basedir}/target</directory>
<outputDirectory>${project.build.directory}/classes</outputDirectory>
<finalName>${project.artifactId}-${project.version}</finalName>
<testO...
How to force HTTPS using a web.config file
... in Startup.cs
app.UseHpkp(options => options
.Sha256Pins(
"Base64 encoded SHA-256 hash of your first certificate e.g. cUPcTAZWKaASuYWhhneDttWpY3oBAkE3h2+soZS7sWs=",
"Base64 encoded SHA-256 hash of your second backup certificate e.g. M8HztCzM3elUxkcjR2S5P4hhyBNf6lHkmjAHKhpGPWE...
Nullable types and the ternary operator: why is `? 10 : null` forbidden? [duplicate]
... to an int?. Note that another possibility would be to box the int 10 to a base class or interface of System.Int32. As an example GetBoolValue() ? (IFormattable)10 : null // #1B or GetBoolValue() ? 10 : (IFormattable)null // #2B will be OK. This possibility may be a reason why they don't make the nu...