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Why can't I inherit static classes?
I have several classes that do not really need any state. From the organizational point of view, I would like to put them into hierarchy.
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What does Python's eval() do?
...less until you find a need for it. It is used on sites like codepad.org to allow you to execute scripts in a test environment. eval() can also be used to execute highly-dynamic code, but you should make yourself fully aware of the security and performance risks before using it.
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Implicit type conversion rules in C++ operators
...s int. So short/char are promoted to int before the operation is done.
In all your expressions the int is promoted to a float before the operation is performed. The result of the operation is a float.
int + float => float + float = float
int * float => float * float = float
float * int =&g...
How to delete files older than X hours
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Using --mmin +X returns all files with my find. My fault for not checking this first, but this command just deleted most of my home directory. For me, --mmin -X is the correct argument.
– brandones
Oct 16 '13 a...
“Delegate subtraction has unpredictable result” in ReSharper/C#?
...esn't guarantee an order of execution for its subscribers, so it doesn't really affect you either.
Since the above mechanics can lead to unpredictable results, ReSharper issues a warning whenever it encounters a delegate subtraction operator.
ReSharper is issuing this warning because multicast...
Measuring elapsed time with the Time module
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user2035895
322 bronze badges
answered Sep 1 '10 at 18:22
Vadim ShenderVadim Shender
6,358...
How to check if a string contains an element from a list in Python
...y strings in a list are found in another string, keep in mind that this is all that this solution does. It does not care WHERE the string is found e.g. in the ending of the string. If this is important, as is often the case with urls, you should look to the answer of @Wladimir Palant, or you risk ge...
Why can't I call read() twice on an open file?
...ntents of a given file twice using the read() method. Strangely, when I call it the second time, it doesn't seem to return the file content as a string?
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Cartesian product of multiple arrays in JavaScript
...S
Original 2017 Answer: 2-line answer with vanilla JS:
(see updates below)
All of the answers here are overly complicated, most of them take 20 lines of code or even more.
This example uses just two lines of vanilla JavaScript, no lodash, underscore or other libraries:
let f = (a, b) => [].concat...
Sorting an ArrayList of objects using a custom sorting order
...tch (Exception e) {
// If this exception occurs, then it is usually a fault of the developer.
throw new RuntimeException("Cannot compare " + o1 + " with " + o2 + " on " + getter, e);
}
return (o1 == null) ? -1 : ((o2 == null) ? 1 : ((Comparable<Object>)...