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Using python map and other functional tools
...u ALWAYS get the same output. This avoids a vipers nest of bugs introduced by having global state. As maptest depends on an external definition of bars, this principle is broken.
– image_doctor
Jul 10 '13 at 13:22
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How to create a hash or dictionary object in JavaScript [duplicate]
...JavaScript. It can be used instead of simply using Object. It is supported by current versions of all major browsers.
Maps do not support the [subscript] notation used by Objects. That syntax implicitly casts the subscript value to a primitive string or symbol. Maps support any values as keys, so y...
git diff two files on same branch, same commit
...t for that, just use diff fileA.php fileB.php (or vimdiff if you want side by side comparison)
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What is the difference between a field and a property?
...o change the fields while not affecting the external way they are accessed by the things that use your class.
public class MyClass
{
// this is a field. It is private to your class and stores the actual data.
private string _myField;
// this is a property. When accessed it uses the un...
Is there any difference between a GUID and a UUID?
...fference, they are the same thing.
2020-08-20 Update: While GUIDs (as used by Microsoft) and UUIDs (as defined by RFC4122) look similar and serve similar purposes, there are subtle-but-occasionally-important differences. Specifically, some Microsoft GUID docs allow GUIDs to contain any hex digit in...
Differences between utf8 and latin1
...s article useful (and even more if you know a bit Java).
Note that full 4-byte UTF-8 support was only introduced in MySQL 5.5. Before that version, it only goes up to 3 bytes per character, not 4 bytes per character. So, it supported only the BMP plane and not e.g. the Emoji plane. If you want full...
Python: Using .format() on a Unicode-escaped string
...coding for your environment, which was likely set to UTF-8. (You can check by doing import sys; print sys.stdout.encoding)
>>> print "{0}".format(s)
fails because format tries to match the encoding of the type that it is called on (I couldn't find documentation on this, but this is the be...
In MySQL, can I copy one row to insert into the same table?
...
Update 07/07/2014 - The answer based on my answer, by Grim..., is a better solution as it improves on my solution below, so I'd suggest using that.
You can do this without listing all the columns with the following syntax:
CREATE TEMPORARY TABLE tmptable SELECT * FROM tabl...
What is a “cache-friendly” code?
...s usually refers to a hit/miss in the highest level of cache in the CPU -- by highest level I mean the largest == slowest. The cache hit rate is crucial for performance since every cache miss results in fetching data from RAM (or worse ...) which takes a lot of time (hundreds of cycles for RAM, tens...
How do I parallelize a simple Python loop?
... to execute {sum(output2)} = sum({repr(output2)})')
print(f'time saved by parallelizing: {sum(output2) - (finish-start)}')
print(f'returned in order given: {repr(output3)}')
if __name__ == '__main__':
main()
And here's the output:
$ python3 -m futuretest
original inputs: [0.0, 1.0, 2...