...) )); then … fi Explanation Piping through the basic calculator command bc returns either 1 or 0. The option -l is equivalent to --mathlib; it loads the standard math library. Enclosing the whole expression between double parenthesis (( )) will translate these values to respectively true or...

What's the difference between an URI, URL and URN? I have read a lot of sites (even Wikipedia) but I don't understand it. 4...

... The AAR file consists of a JAR file and some resource files (it is basically a standard zip file with a custom file extension). Here are the steps to convert: Extract the AAR file using standard zip extract (rename it to *.zip to make it easier) Find the clas...

...ing at a HTML 5 boilerplate template (from http://html5boilerplate.com/ ) and noticed the use of "?v=1" in URLs when referring to CSS and Javascript files. ...

...ld from is all about. Because, let's face it, if all yield from does is expand the for loop, then it does not warrant adding yield from to the language and preclude a whole bunch of new features from being implemented in Python 2.x. What yield from does is it establishes a transparent bidirectional...

...u can sometimes use some combination of reduce (from the functools module) and the operator module, e.g.: def product(xs): return reduce(operator.mul, xs, 1) Be aware that reduce is actually a foldl, in Haskell terms. There is no special syntax to perform folds, there's no builtin foldr, and ...

... This is called finding the k-th order statistic. There's a very simple randomized algorithm (called quickselect) taking O(n) average time, O(n^2) worst case time, and a pretty complicated non-randomized algorithm (called introselect) taking O(n) worst case time. There's some info on Wikipedia, bu...

...is like this. In most programming languages, it is based on the IEEE 754 standard. The crux of the problem is that numbers are represented in this format as a whole number times a power of two; rational numbers (such as 0.1, which is 1/10) whose denominator is not a power of two cannot be exactly re...

.... VARCHAR(M) variable max size of M characters M needs to be between 1 and 65535 takes 1 + c bytes (for M ≤ 255) or 2 + c (for 256 ≤ M ≤ 65535) bytes of disk space where c is the length of the stored string can be part of an index More Details TEXT has a fixed max size of 2¹⁶-1 = 655...

I'm new to Clojure and have been using Compojure to write a basic web application. I'm hitting a wall with Compojure's defroutes syntax, though, and I think I need to understand both the "how" and the "why" behind it all. ...