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Quickly reading very large tables as dataframes
...
Thanks for the tips Richie. I did a little testing, and it seems that the performance gains with using the nrow and colClasses options for read.table are quite modest. For example, reading a ~7M row table takes 78s without the options, and 67s with the options. (note...
C++ project organisation (with gtest, cmake and doxygen)
...stall on their
platform. CMake comes with a find_package script for Google
Test. This makes things a lot easier. I would go with bundling only
when necessary and avoid it otherwise.
How to build: Avoid in-source builds. CMake makes out of source-builds
easy and it makes life a lot easier.
I suppos...
What is the difference between “def” and “val” to define a function
...n
//Boolean = true
With def you can get new function on every call:
val test: () => Int = {
val r = util.Random.nextInt
() => r
}
test()
// Int = -1049057402
test()
// Int = -1049057402 - same result
def test: () => Int = {
val r = util.Random.nextInt
() => r
}
test()
// In...
Check if the number is integer
...nctions and no hacks:
all.equal(a, as.integer(a))
What's more, you can test a whole vector at once, if you wish. Here's a function:
testInteger <- function(x){
test <- all.equal(x, as.integer(x), check.attributes = FALSE)
if(test == TRUE){ return(TRUE) }
else { return(FALSE) }
}
...
Fastest way to remove first char in a String
...a problem for you - in which case the only way you'd know would be to have test cases, and then it's easy to just run those test cases for each option and compare the results. I'd expect Substring to probably be the fastest here, simply because Substring always ends up creating a string from a singl...
Get all Attributes from a HTML element with Javascript/jQuery
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I tested and it works with dynamically added attributes (chrome)
– CodeToad
May 25 '16 at 8:37
...
Using a bitmask in C#
...6, Sun = 32 }
DaysBitMask mask = DaysBitMask.Sat | DaysBitMask.Thu;
bool test;
if ((mask & DaysBitMask.Sat) == DaysBitMask.Sat)
test = true;
if ((mask & DaysBitMask.Thu) == DaysBitMask.Thu)
test = true;
if ((mask & DaysBitMask.Wed) != DaysBitMask.Wed)
test = true;
// Store...
How do I Moq a method that has an optional argument in its signature without explicitly specifying i
...venience for calling code, but I think that you should be explicit in your tests. Say you could leave out specifying the bool parameter. What happens if, in future, someone changes the default value of b to true? This will lead to failing tests (and rightfully so), but they will be more difficult to...
Mocking vs. Spying in mocking frameworks
...can create mock out of "thin air". This is what is mostly used during unit testing.
When spying, you take an existing object and "replace" only some methods. This is useful when you have a huge class and only want to mock certain methods (partial mocking). Let me quote Mockito documentation:
You ca...
Why can't enum's constructor access static fields?
...tialized in the order in which they appear in code. For e.g.
public class Test4 {
private static final Test4 test4 = new Test4();
private static int j = 6;
Test4() {
System.out.println(j);
}
private static void test() {
}
public st...