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Why covariance and contravariance do not support value type
IEnumerable<T> is co-variant but it does not support value type, just only reference type. The below simple code is compiled successfully:
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Do login forms need tokens against CSRF attacks?
From what I've learned so far, the purpose of tokens is to prevent an attacker from forging a form submission.
4 Answers
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What is the shortest function for reading a cookie by name in JavaScript?
What is the shortest, accurate, and cross-browser compatible method for reading a cookie in JavaScript?
15 Answers
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Replace a value in a data frame based on a conditional (`if`) statement
In the R data frame coded for below, I would like to replace all of the times that B
appears with b .
8 Answers
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What is the difference between the Data Mapper, Table Data Gateway (Gateway), Data Access Object (DA
I'm trying to brush up on my design pattern skills, and I'm curious what are the differences between these patterns? All of them seem like they are the same thing - encapsulate the database logic for a specific entity so the calling code has no knowledge of the underlying persistence layer. From m...
Where to use EJB 3.1 and CDI?
I am making a Java EE based product in which I'm using GlassFish 3 and EJB 3.1.
2 Answers
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Easiest way to pass an AngularJS scope variable from directive to controller?
What is the easiest way to pass an AngularJS scope variable from directive to controller? All of the examples that I've seen seem so complex, isn't there a way I can access a controller from a directive, and set one of it's scope variables?
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When does invoking a member function on a null instance result in undefined behavior?
Consider the following code:
2 Answers
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Create a date from day month and year with T-SQL
I am trying to convert a date with individual parts such as 12, 1, 2007 into a datetime in SQL Server 2005. I have tried the following:
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