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Java List.add() UnsupportedOperationException
...t about this by reading the documentation of UnsupportedOperationException and List.add(), which documents this to be an "(optional operation)". The precise meaning of this phrase is explained at the top of the List documentation.
As a workaround you can create a copy of the list to a known-modifia...
Checking that a List is not empty in Hamcrest
...g if anyone knew of a way to check if a List is empty using assertThat() and Matchers ?
5 Answers
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What is the difference between _tmain() and main() in C++?
...n does.
_tmain is a Microsoft extension.
main is, according to the C++ standard, the program's entry point.
It has one of these two signatures:
int main();
int main(int argc, char* argv[]);
Microsoft has added a wmain which replaces the second signature with this:
int wmain(int argc, wchar_t* ...
difference between foldLeft and reduceLeft in Scala
I have learned the basic difference between foldLeft and reduceLeft
7 Answers
7
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Read-only list or unmodifiable list in .NET 4.0
...edited Jun 30 '14 at 18:17
Aleksandr Dubinsky
18.3k1212 gold badges5959 silver badges8787 bronze badges
answered Jun 11 '09 at 22:19
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Is there a ternary conditional operator in T-SQL?
...E isExternal = IIF(@type = 2, 1, 0)
Also note: in T-SQL, the assignment (and comparison) operator is just = (and not == - that's C#)
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Dynamic variable names in Bash
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Use an associative array, with command names as keys.
# Requires bash 4, though
declare -A magic_variable=()
function grep_search() {
magic_variable[$1]=$( ls | tail -1 )
echo ${magic_variable[$1]}
}
If you can't use associative arrays (e.g., you m...
Getting the error “Missing $ inserted” in LaTeX
...
The "Missing $ inserted" is probably caused by the underscores and bars. These characters in LaTeX have special meaning in math mode (which is delimited by $ characters). Try escaping them; e.g. update\_element instead of update_element.
However, if you're trying to display code, a bet...
Case objects vs Enumerations in Scala
...es. However, I find in general that enumerations are a bit clumsy in Scala and have the feel of an awkward add-on, so I now tend to use case objects. A case object is more flexible than an enum:
sealed trait Currency { def name: String }
case object EUR extends Currency { val name = "EUR" } //etc.
...
Why doesn't Dictionary have AddRange?
... because no one ever designed, specified, implemented, tested, documented and shipped that feature. - @Gabe Moothart
As to why? Well, likely because the behavior of merging dictionaries can't be reasoned about in a manner that fits with the Framework guidelines.
AddRange doesn't exist because a ...