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On design patterns: When should I use the singleton?
... A print spooler does not meet the criteria. You may want a test print spooler that doesn't actually print, for testing.
– user253751
Jul 1 at 15:09
add a comme...
Inserting HTML into a div
... can use insertAdjacentHTML - however I dig into and make some performance tests - (2019.09.13 Friday) MacOs High Sierra 10.13.6 on Chrome 76.0.3809 (64-bit), Safari 12.1.2 (13604.5.6), Firefox 69.0.0 (64-bit) ). The test F is only for reference - it is out of the question scope because we need to i...
TypeError: Missing 1 required positional argument: 'self'
...here.
Use
p = Pump()
p.getPumps()
Small example -
>>> class TestClass:
def __init__(self):
print("in init")
def testFunc(self):
print("in Test Func")
>>> testInstance = TestClass()
in init
>>> testInstance.testFunc()
in Test ...
Generating random strings with T-SQL
...
When generating random data, specially for test, it is very useful to make the data random, but reproducible. The secret is to use explicit seeds for the random function, so that when the test is run again with the same seed, it produces again exactly the same strings...
How to write a:hover in inline CSS?
...t link, and I really wish it worked, sadly it does not. Just to confirm, I tested using the syntax style="{color:green;} :hover { color: red; }" and firefox managed to color the link green, but ignored the hover. Chrome ignored both. Continued testing would be pretty pointless.
...
Benchmarking (python vs. c++ using BLAS) and (numpy)
...enBLAS and MKL perform on the same level, with the exception of Eigenvalue test.
The Eigenvalue test performs only reasonably well on OpenBLAS in single threaded mode.
In multi-threaded mode the performance is worse.
The "Matrix size vs threads chart" also show that although MKL as well as OpenBL...
String concatenation in MySQL
...e CONCAT function:
SELECT CONCAT(first_name, " ", last_name) AS Name FROM test.student
As @eggyal pointed out in comments, you can enable string concatenation with the || operator in MySQL by setting the PIPES_AS_CONCAT SQL mode.
...
Is “double hashing” a password less secure than just hashing it once?
...a desktop system can compute 1 million hashes per second. The attacker can test her whole list is less than three hours if only one iteration is used. But if just 2000 iterations are used, that time extends to almost 8 months. To defeat a more sophisticated attacker—one capable of downloading a pr...
Java: how can I split an ArrayList in multiple small ArrayLists?
...ecause java doc stats : The outer list is unmodifiable, but reflects the latest state of the source list. The inner lists are sublist views of the original list. This is
– Junchen Liu
Mar 2 '15 at 17:18
...
HashSet versus Dictionary w.r.t searching time to find if an item exists
...
HashSet vs List vs Dictionary performance test, taken from here.
Add 1000000 objects (without checking duplicates)
Contains check for half the objects of a collection of 10000
Remove half the objects of a collection of 10000
...