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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala

...rList.foldLeft(0)(_ + _)) Took 2589.363031 milli seconds reduce vs fold Now this is where it gets a little closer to the FP / mathematical roots, and a little trickier to explain. Reduce is defined formally as part of the MapReduce paradigm, which deals with orderless collections (multisets), Fo...
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How to overcome TypeError: unhashable type: 'list'

...nto a list where each element is a line for line in f.readlines(): # Now we split the file on `x`, since the part before the x will be # the key and the part after the value line = line.split('x') # Take the line parts and strip out the spaces, assigning them to the variables #...
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Fastest way to list all primes below N

...tmp) )//const del_mult(tmptk[off], start, prime) # now we go back to top tk1, so we need to increase pos by 1 pos += 1 cpos = const * pos # 30k + 1 if tk1[pos]: prime = cpos + 1 p.append(prime) lastadded = 1 ...
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How to write to Console.Out during execution of an MSTest test

...thod] public void TestMethod1() { Debug.WriteLine("Time {0}", DateTime.Now); System.Threading.Thread.Sleep(30000); Debug.WriteLine("Time {0}", DateTime.Now); } Output share | improve...
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error: ‘NULL’ was not declared in this scope

... Now that C++11 is more generally supported by compilers, it might be worth mentioning the nullptr keyword, which is an actual keyword and doesn't require any #includes. It's also more typesafe than NULL. ...
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Make XAMPP/Apache serve file outside of htdocs [closed]

...e the old one) if you are using Vista and have trouble). Restart Apache. Now you can access that directory by browsing to http://transitcalculator.localhost/. Make an Alias Starting ~line 200 of your http.conf file, copy everything between <Directory "C:/xampp/htdocs"> and </Director...
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Disable firefox same origin policy

...om here (mirror, may not be updated). Or download the files from GitHub. Now it's also on Firefox Marketplace: Download here. In this case, the addon is installed after you click install and you can skip to step 4. If you downloaded the xpi you can jump to step 3. If you downloaded the zip from G...
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How to use JavaScript source maps (.map files)?

... The .map files are for js and css (and now ts too) files that have been minified. They are called SourceMaps. When you minify a file, like the angular.js file, it takes thousands of lines of pretty code and turns it into only a few lines of ugly code. Hopefully, w...
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leiningen - how to add dependencies for local jars?

... you could see if there's anything over there which can solve your problem now / might solve it in the future, when feature sets mature? Anyway, it is possible that Leiningen may not in fact have a good story ready yet for some complex scenarios. If you feel this may be true of your case (and I mea...
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Eclipse error “ADB server didn't ACK, failed to start daemon”

...sk manager, which has adb.exe process and end (kill) that process Step 2: Now, close the eclipse, which is currently running on my computer. Step 3: Again, restart eclipse then solved that problem. For those using OS X killall adb For those using Windows adb kill-server should do the tric...