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Rails 4: before_filter vs. before_action
...ifference, in rails app there is CRUD, and seven actions basically by name index, new, create, show, update, edit, destroy.
Rails 4 make it developer friendly to change syntax before filter to before action.
before_action call method before the actions which we declare, like
before_action :set_ev...
Meaning of Open hashing and Closed hashing
...e rest helps).
For instance, the "open" in "open addressing" tells us the index (aka. address) at which an object will be stored in the hash table is not completely determined by its hash code. Instead, the index may vary depending on what's already in the hash table.
The "closed" in "closed ha...
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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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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WHERE vs HAVING
...range | value | value | 4 | NULL | 5 | Using where; Using index |
+----+-------------+-------+-------+---------------+-------+---------+------+------+--------------------------+
EXPLAIN SELECT `value` v FROM `table` having `value`>5;
+----+-------------+-------+-------+---------...
How to split a column into two columns?
...
Be aware that .tolist() will remove any indexes you had, so your new Dataframe will be reindexed from 0 (It doesn't matter in your specific case).
– Crashthatch
Mar 27 '13 at 14:59
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Using varchar(MAX) vs TEXT on SQL Server
...regard to if you should use LIKE to search, or if you should use Full Text Indexing and CONTAINS. This question is the same regardless of VARCHAR(MAX) or TEXT.
If you are searching large amounts of text and performance is key then you should use a Full Text Index.
LIKE is simpler to implement and ...
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...
Binary search (bisection) in Python
...erting or deleting ranges), which are O(1) or O(|range|), given a starting index. If you aren't using those sorts of operations often, then storing as sets, and sorting for display might be a better deal overall. set() incurs very little additional overhead in python.
...
What does the tilde (~) mean in my composer.json file?
...swered Sep 24 '13 at 11:29
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