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How to do exponentiation in clojure?

... classic recursion (watch this, it blows stack) (defn exp [x n] (if (zero? n) 1 (* x (exp x (dec n))))) tail recursion (defn exp [x n] (loop [acc 1 n n] (if (zero? n) acc (recur (* x acc) (dec n))))) functional (defn exp ...
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What does the question mark operator mean in Ruby?

... It is a code style convention; it indicates that a method returns a boolean value. The question mark is a valid character at the end of a method name. ...
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Is AsyncTask really conceptually flawed or am I just missing something?

I have investigated this problem for months now, came up with different solutions to it, which I am not happy with since they are all massive hacks. I still cannot believe that a class that flawed in design made it into the framework and no-one is talking about it, so I guess I just must be missing ...
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How do you automatically set text box to Uppercase?

...at when the user starts typing in the text box for example railway , then it should be altered to capital letters like RAILWAY without the user having to press the Caps-lock button. ...
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How to Decrease Image Brightness in CSS

...s in CSS. I searched a lot but all I've got is about how to change the opacity, but that makes the image more bright. can anyone help me ? ...
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Reverting to a specific commit based on commit id with Git? [duplicate]

With git log , I get a list of commits that I have made so far. 4 Answers 4 ...
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How to find what code is run by a button or element in Chrome using Developer Tools

I'm using Chrome and my own website. 5 Answers 5 ...
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Select N random elements from a List in C#

I need a quick algorithm to select 5 random elements from a generic list. For example, I'd like to get 5 random elements from a List<string> . ...
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pdftk compression option

...elated (lossless, but may display slightly differently): gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dBATCH -dQUIET -sOutputFile=output.pdf input.pdf Edit: I just discovered another option (for lossless compression), which avoids the nasty gs command. qpdf is ...
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Clearing purchases from iOS in-app purchase sandbox for a test user

...mail address, password, secret question, secret answer, date of birth, and iTunes store country. You can put exactly the same data (including password) for tester+01@gmail.com and tester+02@gmail.com and you will have two test accounts. Finally, in your tester@gmail.com inbox you will receive two ...