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How to remove single character from a String
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One possibility:
String result = str.substring(0, index) + str.substring(index+1);
Note that the result is a new String (as well as two intermediate String objects), because Strings in Java are immutable.
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How to test code dependent on environment variables using JUnit?
...for System Rules as suggested by Stefan Birkner. Its use was simple. But sooner than later, I found the behavior erratic. In one run, it works, in the very next run it fails. I investigated and found that System Rules work well with JUnit 4 or higher version. But in my cases, I was using some Jars w...
Efficient way to return a std::vector in c++
...wever, in your swap() variant (for C++03 without NRVO) you still will have one copy-constructor copy made inside f(): from variable result to a hidden temporary object which will be at last swapped to myvec.
– JenyaKh
Jul 6 '17 at 4:49
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Image fingerprint to compare similarity of many images
...roach for improved comparison quality
A luminosity histogram (especially one that is separated into RGB components) is a reasonable fingerprint for an image - and can be implemented quite efficiently. Subtracting one histogram from another will produce a new historgram which you can process to dec...
Elegant way to search for UTF-8 files with BOM?
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What about this one simple command which not just finds but clears the nasty BOM? :)
find . -type f -exec sed '1s/^\xEF\xBB\xBF//' -i {} \;
I love "find" :)
Warning The above will modify binary files which contain those three characters....
What is SELF JOIN and when would you use it? [duplicate]
...urrent employee.
To query the data and get information for both people in one row, you could self join like this:
select e1.EmployeeID,
e1.FirstName,
e1.LastName,
e1.SupervisorID,
e2.FirstName as SupervisorFirstName,
e2.LastName as SupervisorLastName
from Employee e1
left o...
What's the difference between Ruby's dup and clone methods?
...rent semantics. In Object itself, there are two key differences.
First, clone copies the singleton class, while dup does not.
o = Object.new
def o.foo
42
end
o.dup.foo # raises NoMethodError
o.clone.foo # returns 42
Second, clone preserves the frozen state, while dup does not.
class Foo
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Use of 'prototype' vs. 'this' in JavaScript?
...d in the expression.
Another example is below. It's similar to the first one (and maybe what you meant to ask about):
var A = new function () {
this.x = function () {
//do something
};
};
In this example, the new operator has been added before the function expression so that the...
How can I pretty-print JSON in a shell script?
...at I can just run: command params | pretty. Hope this helps. PS: Should anyone manages to extend this to a) remove the curl-output I'm seeing every time and/or b) NOT sort the json keys; please do let me know, I will be highly thankful.
– Clint Eastwood
Feb 25 ...
Python matplotlib multiple bars
...You could easily generate the dates required with numpy's datetime64: e.g. One month worth: np.arange('2012-02', '2012-03', dtype='datetime64[D]'). You might need to think harder about the best way to represent this data if you have 40 datasets (as per another comment) spanning over 100 days.
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