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When and why are database joins expensive?
I'm doing some research into databases and I'm looking at some limitations of relational DBs.
7 Answers
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What does “coalgebra” mean in the context of programming?
...they make everything look cooler!)
An algebra, then, is just a type τ with some functions and identities. These functions take differing numbers of arguments of type τ and produce a τ: uncurried, they all look like (τ, τ,…, τ) → τ. They can also have "identities"—elements of τ that ha...
Pass a JavaScript function as parameter
How do I pass a function as a parameter without the function executing in the "parent" function or using eval() ? (Since I've read that it's insecure.)
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What's the difference between EscapeUriString and EscapeDataString?
If only deal with url encoding, I should use EscapeUriString ?
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Merge, update, and pull Git branches without using checkouts
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As long as you're doing a fast-forward merge, then you can simply use
git fetch <remote> <sourceBranch>:<destinationBranch>
Examples:
# Merge local branch foo into local branch master,
# without having to checkout master first.
# Here `.` means to use the local repository as t...
how does Array.prototype.slice.call() work?
I know it is used to make arguments a real array, but I don't understand what happens when using Array.prototype.slice.call(arguments)
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Singletons vs. Application Context in Android?
...eral examples of Android applications using singleton pattern, I wonder if it's a good idea to use Singletons instead of single instances shared through global application state (subclassing android.os.Application and obtaining it through context.getApplication()).
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Determining if a number is either a multiple of ten or within a particular set of ranges
I have a few loops that I need in my program. I can write out the pseudo code, but I'm not entirely sure how to write them logically.
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When do Java generics require
Given the following example (using JUnit with Hamcrest matchers):
7 Answers
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C# DLL config file
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It is not trivial to create a .NET configuration file for a .DLL, and for good reason. The .NET configuration mechanism has a lot of features built into it to facilitate easy upgrading/updating of the app, and to protect ins...