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LINQ Contains Case Insensitive
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StartWith converts to LIKE 'hello%' ?
– Bart Calixto
Jun 30 '14 at 19:13
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#define macro for debug printing in C?
Trying to create a macro which can be used for print debug messages when DEBUG is defined, like the following pseudo code:
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Are Exceptions in C++ really slow
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You can never claim about performance unless you convert the code to the assembly or benchmark it.
Here is what you see: (quick-bench)
The error code is not sensitive to the percentage of occurrence. Exceptions have a little bit overhead as long as they are never thrown. ...
Combine Date and Time columns using python pandas
...etime64[ns]
Note: surprisingly (for me), this works fine with NaNs being converted to NaT, but it is worth worrying that the conversion (perhaps using the raise argument).
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How to add dividers and spaces between items in RecyclerView?
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October 2016 Update
The version 25.0.0 of Android Support Library introduced DividerItemDecoration class:
DividerItemDecoration is a RecyclerView.ItemDecoration that can be used as a divider between items of a LinearLayoutManager. It supports both HORIZONTAL and VERTICAL orientations.
Usa...
Explain the use of a bit vector for determining if all characters are unique
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int checker is used here as a storage for bits. Every bit in integer value can be treated as a flag, so eventually int is an array of bits (flag). Each bit in your code states whether the character with bit's index was found ...
Algorithm to generate all possible permutations of a list?
...or iteratively if you like pain) until the last item is reached at which point there is only one possible order.
So with the list [1,2,3,4] all the permutations that start with 1 are generated, then all the permutations that start with 2, then 3 then 4.
This effectively reduces the problem from on...
Reverse of JSON.stringify?
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I read the OP as saying "I converted a javascript object to a JSON string, and now I want to convert it back - how do I do it?" All the other answers say just use JSON.parse. I'm just warning that theres a lot of cases that will not handle correctly. I...
snprintf and Visual Studio 2010
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Short story: Microsoft has finally implemented snprintf in Visual Studio 2015. On earlier versions you can simulate it as below.
Long version:
Here is the expected behavior for snprintf:
int snprintf( char* buffer, std::size_t buf_size, const char* format, ... );
Wr...
Simultaneously merge multiple data.frames in a list
..., by = "i")
# A tibble: 3 x 4
# i j k l
# <chr> <int> <int> <int>
# 1 a 1 NA 9
# 2 b 2 4 NA
# 3 c 3 5 7
You can also perform other joins, such as a full_join or inner_join:
list(x, y, z) %>% reduce(full_join, by = "i...