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Best way to merge two maps and sum the values of same key?
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The shortest answer I know of that uses only the standard library is
map1 ++ map2.map{ case (k,v) => k -> (v + map1.getOrElse(k,0)) }
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Open file in a relative location in Python
Suppose python code is executed in not known by prior windows directory say 'main' , and wherever code is installed when it runs it needs to access to directory 'main/2091/data.txt' .
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Should I use 'has_key()' or 'in' on Python dicts?
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has_key() is now removed in Python 3
– Vadim Kotov
Nov 14 '19 at 15:21
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Use of #pragma in C
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Note that the order of output can vary on different machines.
now let me tell you what #pragma did...
it tells the OS to run the some block of code on 4 threads
this is just one of many many applications you can do with the little #pragma
sorry for the outside sample OpenMP
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Overloading Macro on Number of Arguments
...unctions:
int FOO4(int a, int b, int c, int d) { return a + b + c + d; }
Now you can use FOO with 2, 3 and 4 arguments:
FOO(42, 42) // will use makro function FOO2
FOO(42, 42, 42) // will use makro function FOO3
FOO(42, 42, 42, 42) // will call FOO4 function
Limitations
Only up to 63 argument...
Windows threading: _beginthread vs _beginthreadex vs CreateThread C++
...do it's own initialization of the thread. Only C/C++ programmers need to know this as they should now the rules of using their own development environment.
If you use _beginthread you do not need to call CloseHandle as the RTL will do for you. This is why you cannot wait on the handle if you have...
JavaScript global event mechanism
...ough...
Update: it doesn't work in Opera, but I'm hacking Dragonfly right now to see what it gets. Suggestion about hacking Dragonfly came from this question:
Mimic Window. onerror in Opera using javascript
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Android Studio - How to increase Allocated Heap Size
I've been using Android Studio for 3 months now and one of the apps I started on it has become fairly large. The memory usage indicated at the bottom right of the program says my allocated heap is maxed at 494M.
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How to read a file in reverse order?
...ek() is never encoding-aware, read() is if you open the file in text mode. Now if have 'aöaö' * 1000000, your blocks will not be aligned correctly.
– norok2
Nov 14 '18 at 13:25
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How to make rounded percentages add up to 100%
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@VarunVohra sorry i didn't notice this until now, yes it looks like your algorithm is the same :) not sure why my post is the accepted answer, the obfuscated code was just for the lolz...
– yonilevy
Mar 31 '14 at 10:40
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