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Is “IF” expensive?
...itional branch is only taken if a certain condition holds (such as whether one number equals another); if the branch is not taken, control proceeds to the next instruction after the branch like normal. For unconditional branches, the branch is always taken. Conditional branches show up in if state...
How do I use boolean variables in Perl?
... the right argument. Its not boolean but sometimes you may want to know if one argument ir equal or less than or greater than the other instead of just equal or not equal.
– user118435
Jun 24 '09 at 6:47
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“Conversion to Dalvik format failed with error 1” on external JAR
... after javadoc generated code will works fine.Please check this too if any one still occurs.
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NoSQL (MongoDB) vs Lucene (or Solr) as your database
...ly easier transition for programmers detoxing from the RDBMS world. Unless one's used to it Lucene & Solr have a steeper learning curve.
There aren't many examples of using Lucene/Solr as a datastore, but Guardian has made some headway and summarize this in an excellent slide-deck, but they too ...
What is the difference between the kernel space and the user space?
...the kernel is doing things on behalf of a process (e.g., I/O) and at least one more kernel stack that's exclusively for internal use by the kernel (e.g., for scheduling).
– Jerry Coffin
May 10 '11 at 23:38
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Why is try {…} finally {…} good; try {…} catch{} bad?
...exception within their scope. Anything else should be passed along for someone else to handle. If I have an application that gets a file name from users then reads the file, and my file reader gets an exception opening the file, it should pass them up (or consume the exception and throw a new one) s...
Mapping two integers to one, in a unique and deterministic way
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Cantor pairing function is really one of the better ones out there considering its simple, fast and space efficient, but there is something even better published at Wolfram by Matthew Szudzik, here. The limitation of Cantor pairing function (relatively) is th...
How do you serialize a model instance in Django?
...is your model instance
dict_obj = model_to_dict( obj )
You now just need one straight json.dumps call to serialize it to json:
import json
serialized = json.dumps(dict_obj)
That's it! :)
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Delete commits from a branch in Git
...asked for an already made commit. If you reset --hard, and check the log --oneline --all, the commits still remain in the tree. How do we delete these commits from tree? Thanks.
– iGbanam
Mar 17 '13 at 3:09
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Scala how can I count the number of occurrences in a list
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A somewhat cleaner version of one of the other answers is:
val s = Seq("apple", "oranges", "apple", "banana", "apple", "oranges", "oranges")
s.groupBy(identity).mapValues(_.size)
giving a Map with a count for each item in the original sequence:
Map(b...