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What does the ^ operator do in Java?
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422
The ^ operator in Java
^ in Java is the exclusive-or ("xor") operator.
Let's take 5^6 as exam...
Finding index of character in Swift String
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32 Answers
32
Active
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How to open multiple pull requests on GitHub
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edited Oct 27 '19 at 13:17
ahmednabil88
11.8k99 gold badges3939 silver badges7878 bronze badges
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Pass a data.frame column name to a function
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You can just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[,column])
}
fun1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function...
What is the purpose and use of **kwargs?
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edited Jul 29 '18 at 23:24
omkaartg
2,03811 gold badge66 silver badges2121 bronze badges
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Difference between array_map, array_walk and array_filter
... preserve the keys.
Example:
<pre>
<?php
$origarray1 = array(2.4, 2.6, 3.5);
$origarray2 = array(2.4, 2.6, 3.5);
print_r(array_map('floor', $origarray1)); // $origarray1 stays the same
// changes $origarray2
array_walk($origarray2, function (&$v, $k) { $v = floor($v); });
print_...
Overloading Macro on Number of Arguments
I have two macros FOO2 and FOO3 :
8 Answers
8
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R: += (plus equals) and ++ (plus plus) equivalent from c++/c#/java, etc.?
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edited Jan 26 '18 at 13:02
zx8754
38.6k1010 gold badges8787 silver badges146146 bronze badges
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Outputting data from unit test in python
...hat, like me, comes here looking for a simple and quick answer.
In Python 2.7 you could use an additional parameter msg to add information to the error message like this:
self.assertEqual(f.bar(t2), 2, msg='{0}, {1}'.format(t1, t2))
Offical docs here
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Performance of foreach, array_map with lambda and array_map with static function
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122
FWIW, I just did the benchmark since poster didn't do it. Running on PHP 5.3.10 + XDebug.
UPD...