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What happens when a duplicate key is put into a HashMap?
...value associated with the given key in the map (conceptually like an array indexing operation for primitive types).
The map simply drops its reference to the value. If nothing else holds a reference to the object, that object becomes eligible for garbage collection. Additionally, Java returns any...
Is it fine to have foreign key as primary key?
...concepts in a database and can easily be mixed just as easily as adding an index (which would be a third separate concept).
– blindguy
Jan 24 at 16:57
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What's the best Django search app? [closed]
... We found that Sphinx was the least resource-intensive and fastest way to index and search our documents and that django-sphinx was a nice wrapper on top of the sphinx client.
The group by aggregation is particularly nice, if for example you want to display how many documents with a certain tag or...
How to return a part of an array in Ruby?
...array-slicing syntax to Python. Here is the ri documentation for the array index method:
--------------------------------------------------------------- Array#[]
array[index] -> obj or nil
array[start, length] -> an_array or nil
array[range] ...
Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop
...lice is the fastest way. However, it is even faster if you add the 0 begin index.
myArray.slice(0);
is faster than
myArray.slice();
http://jsperf.com/cloning-arrays/3
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How can I move a single directory from a git repository to a new repository whilst maintaining the h
...wering @ilius's question too), you want something like git filter-branch --index-filter 'git rm -r --cached --ignore-unmatched foodir' -- --all
– Brian Campbell
Apr 24 '14 at 14:36
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Can't install PIL after Mac OS X 10.9
... part of the packages in xcode now:
https://developer.apple.com/downloads/index.action?=command%20line%20tools#
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Reducing Django Memory Usage. Low hanging fruit?
...ion = Dozer(application)
Then point your browser at http://domain/_dozer/index to see a list of all your memory allocations.
I'll also just add my voice of support for mod_wsgi. It makes a world of difference in terms of performance and memory usage over mod_python. Graham Dumpleton's support f...
How can I tell jackson to ignore a property for which I don't have control over the source code?
... you could use setMixInResolver method:
@JsonIgnoreProperties({"id", "index", "version"})
abstract class MixIn {
}
mapper.setMixInResolver(new ClassIntrospector.MixInResolver(){
@Override
public Class<?> findMixInClassFor(Class<?> cls) {
retu...
Hidden features of Python [closed]
...
Wrap an iterable with enumerate and it will yield the item along with its index.
For example:
>>> a = ['a', 'b', 'c', 'd', 'e']
>>> for index, item in enumerate(a): print index, item
...
0 a
1 b
2 c
3 d
4 e
>>>
References:
Python tutorial—looping techniques
Pytho...