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Why is XOR the default way to combine hashes?
...some "noise" if the incoming hashed values are poor (ie, imagine every component hashes to 0 -- the above handles it well, generating a smear of 1 and 0s after each combine. My naive 3*hash(a)+hash(b) simply outputs a 0 in that case).
(For those not familiar with C/C++, a size_t is an unsigned int...
Is the Scala 2.8 collections library a case of “the longest suicide note in history”? [closed]
... Update: The final Scala 2.8 release has a mechanism like the one I described. If you look up BitSet in the scaladocs you find: def map [B] (f: (Int) ⇒ B) : BitSet[B] [use case] Builds a new collection by applying a function to all elements of this bitset.
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Is recursion a feature in and of itself?
...eature" he hadn't taught yet, that was wrong.
Reading between the lines, one possibility is that by using recursion, you avoided ever using a feature that was supposed to be a learning outcome for his course. For example, maybe you didn't use iteration at all, or maybe you only used for loops inst...
What's the difference between “Layers” and “Tiers”?
...within code. You may say you have a "3-tier" system, but be running it on one laptop. You may say your have a "3-layer" system, but have only ASP.NET pages that talk to a database. There's power in precision, friends.
sh...
Swapping two variable value without using third variable
One of the very tricky questions asked in an interview.
27 Answers
27
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How can I search sub-folders using glob.glob module?
... that doesn't list directories recursively. You are listing all text files one level deep, but not in further subdirectories or even directly in path to directory.
– Martijn Pieters♦
May 15 '16 at 21:21
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Multiple submit buttons in an HTML form
Let's say you create a wizard in an HTML form. One button goes back, and one goes forward. Since the back button appears first in the markup when you press Enter , it will use that button to submit the form.
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heroku - how to see all the logs
...an environment for a variety of reasons.
First, if your app has more than one dyno then each log file only represents a partial view into the events of your app. You would have to manually aggregate all the files to get the full view.
Second, the filesystem on Heroku is ephemeral meaning whenever ...
How to break out of nested loops?
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Works, but ugly and not general. What if someone changes the limit to 2000 (suppose the code is longer, so you don't immediately notice it)?
– ugoren
Mar 14 '12 at 8:17
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Is an array name a pointer?
...nt a[7];
a contains space for seven integers, and you can put a value in one of them with an assignment, like this:
a[3] = 9;
Here is a pointer:
int *p;
p doesn't contain any spaces for integers, but it can point to a space for an integer. We can, for example, set it to point to one of the p...