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Why is Scala's immutable Set not covariant in its type?
... Daniel SpiewakDaniel Spiewak
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What is the fundamental difference between WebSockets and pure TCP?
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answered Apr 21 '10 at 9:58
AshAsh
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GROUP_CONCAT comma separator - MySQL
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JavaScript OR (||) variable assignment explanation
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answered Jan 20 '10 at 10:54
unwindunwind
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Correct way to use get_or_create?
..._name='John',
last_name='Lennon',
defaults={'birthday': date(1940, 10, 9)},
)
# get_or_create() didn't have to create an object.
>>> created
False
Explanation:
Fields to be evaluated for similarity, have to be mentioned outside defaults. Rest of the fields have to be included in...
z-index not working with position absolute
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QuentinQuentin
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'float' vs. 'double' precision
...digits: all integers of up to 9 decimal digits can be stored, but a lot of 10-digit numbers can be stored as well.
Why don't doubles
have 14 significant figures?
The encoding of a double uses 64 bits (1 bit for the sign, 11 bits for the exponent, 52 explicit significant bits and one implicit...
Django's SuspiciousOperation Invalid HTTP_HOST header
...csrf attack.
– ramwin
Jan 19 '18 at 10:28
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Shell equality operators (=, ==, -eq)
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And a mistaken string comparison can produce the complete wrong answer. '10' is lexicographically less than '2', so a string comparison returns true or 0. So many are bitten by this bug:
$ [[ 10 < 2 ]]; echo $?
0
vs the correct test for 10 being arithmetically less than 2:
$ [[ 10 -lt 2 ]];...
Select second last element with css
...nth-last-child Browser Support:
Chrome 2
Firefox 3.5
Opera 9.5, 10
Safari 3.1, 4
Internet Explorer 9
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