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Any difference between First Class Function and High Order Function

...s the definitions are certainly subjective and open to debate, but I personally prefer to think that C only supports higher order functions (via function pointers). However, first-class functions are not supported because functions are inferior to other value types like int or char, in the sense tha...
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Running a cron every 30 seconds

...ormatted to ensure it's easy to keep them synchronised. Both cron jobs actually run every minute but the latter one will wait half a minute before executing the "meat" of the job, /path/to/executable. For other (non-cron-based) options, see the other answers here, particularly the ones mentioning fc...
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API Keys vs HTTP Authentication vs OAuth in a RESTful API

... – who claims to be making an API request? Authentication – are they really who they say they are? Authorization – are they allowed to do what they are trying to do? or all three? If you just need to identify the caller to keep track of volume or number of API Calls, use a simple API Key. ...
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Detecting that the browser has no mouse and is touch-only

... not a good way to move forward (and it is somewhat inconsistent). Additionally, unless you are tracking a very specific event or only trying to rule out a few classes above, using events themselves isn't full proof. For example, say you've discovered that a user have emitted a real mousemove (not ...
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How to pull remote branch from somebody else's repo

...ct with one of your own branches is bothersome. In that case, a reference called FETCH_HEAD is available. You can git log FETCH_HEAD to see their commits then do things like cherry-picked to cherry pick their commits. Pushing it back to them: Oftentimes, you want to fix something of theirs and pu...
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How to understand Locality Sensitive Hashing?

...commend the below slide: http://www.cs.jhu.edu/%7Evandurme/papers/VanDurmeLallACL10-slides.pdf . The example in the slide helps me a lot in understanding the hashing for cosine similarity. I borrow two slides from Benjamin Van Durme & Ashwin Lall, ACL2010 and try to explain the intuitions of LS...
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How should I read a file line-by-line in Python?

...pen('filename.txt') as fp: for line in fp: print line We are all spoiled by CPython's relatively deterministic reference-counting scheme for garbage collection. Other, hypothetical implementations of Python will not necessarily close the file "quickly enough" without the with block if...
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How to fix height of TR?

...t designed not to wrap when the container becomes too small.</div> </td> </tr> </table> This way, the div's height is that of the containing cell and the text cannot grow the div, keeping the cell/row the same height no matter what the...
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How to specialize std::hash::operator() for user-defined type in unordered containers?

... You are expressly allowed and encouraged to add specializations to namespace std*. The correct (and basically only) way to add a hash function is this: namespace std { template <> struct hash<Foo> { size_t operator()(const...
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Logging request/response messages when using HttpClient

... intercepts the request before it handles it to HttpClientHandler which finally writes to the wire. PostAsJsonAsync extension internally creates an ObjectContent and when ReadAsStringAsync() is called in the LoggingHandler, it causes the formatter inside ObjectContent to serialize the object and tha...