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git: How to diff changed files versus previous versions after a pull?
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There are all kinds of wonderful ways to specify commits - see the specifying revisions sectio...
Swift Beta performance: sorting arrays
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tl;dr Swift 1.0 is now as fast as C by this benchmark using the default release optimisation lev...
What is a “surrogate pair” in Java?
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The term "surrogate pair" refers to a means of encoding Unicode characters with high code-poin...
Java HashMap performance optimization / alternative
...around 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every object:
public int hashCode() {
// assume that both a an...
Integer division: How do you produce a double?
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Hash collision in git
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Picking atoms on 10 Moons
An SHA-1 hash is a 40 hex character string... that's 4 bits per char...
Random alpha-numeric string in JavaScript? [duplicate]
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Specify width in *characters*
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1em is the height of an M, rather than the width. Same holds for ex, which is the height of an x. More generally speaking, these are the heights of uppercase and lowercase letters.
Width is a totally different issue....
Cha...
What is the best way to conditionally apply a class?
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If you don't want to put CSS class names into Controller like I do, here is an old trick that...