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Remove blank attributes from an Object in Javascript
... test3 : 3,
}
function clean(obj) {
for (var propName in obj) {
if (obj[propName] === null || obj[propName] === undefined) {
delete obj[propName];
}
}
}
clean(test);
If you're concerned about this property removal not running up object's proptype chain, you can also:
funct...
Are non-synchronised static methods thread safe if they don't modify static class variables?
I was wondering if you have a static method that is not synchronised, but does not modify any static variables is it thread-safe? What about if the method creates local variables inside it? For example, is the following code thread-safe?
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multiprocessing.Pool: When to use apply, apply_async or map?
...rast to Pool.apply, the Pool.apply_async method also has a callback which, if supplied, is called when the function is complete. This can be used instead of calling get().
For example:
import multiprocessing as mp
import time
def foo_pool(x):
time.sleep(2)
return x*x
result_list = []
def...
How do I check to see if a value is an integer in MySQL?
...tions to create integers from values, but is there any way to check to see if a value is an integer? Something like is_int() in PHP is what I am looking for.
...
What does “zend_mm_heap corrupted” mean
...
After much trial and error, I found that if I increase the output_buffering value in the php.ini file, this error goes away
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How to express a NOT IN query with ActiveRecord/Rails?
Just to update this since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
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Matrix Transpose in Python
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if you're going to iterate through the results, izip from itertools can save memory for large arrays.
– Antony Hatchkins
Mar 28 '13 at 8:38
...
WPF Timer Like C# Timer
...hat automatically. (That's the advantage of making the timer a Control.) If you don't you'll have a memory leak and possibly other bugs.
– Trade-Ideas Philip
Nov 28 '16 at 14:11
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Useful GCC flags for C
...er overflow (formally "undefined behaviour" in C).
-fverbose-asm is useful if you're compiling with -S to examine the assembly output - it adds some informative comments.
-finstrument-functions adds code to call user-supplied profiling functions at every function entry and exit point.
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How do I raise the same Exception with a custom message in Python?
...(type(e))+" with message " +e.message)
This will also do the right thing if err is derived from ValueError. For example UnicodeDecodeError.
Note that you can add whatever you like to err. For example err.problematic_array=[1,2,3].
Edit: @Ducan points in a comment the above does not work with ...