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Shorthand way for assigning a single field in a record, while copying the rest of the fields?
...e's a nice way of updating record fields. In GHCi you can do --
> data Foo = Foo { a :: Int, b :: Int, c :: String } -- define a Foo
> let foo = Foo { a = 1, b = 2, c = "Hello" } -- create a Foo
> let updateFoo x = x { c = "Goodbye" } -- function to update Foos
> ...
How to test code dependent on environment variables using JUnit?
...MockEnvironment {
public String getVariable() {
return "foobar";
}
}
@Test public void testService() {
service.doSomething(new MockEnvironment());
}
}
The class under test then gets the environment variable using the Environment class, not directly f...
How do I check that multiple keys are in a dict in a single pass?
...
Well, you could do this:
>>> if all (k in foo for k in ("foo","bar")):
... print "They're there!"
...
They're there!
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JavaScript pattern for multiple constructors
...nction with more or fewer than the declared number of arguments.
function foo(a, b) {
if (b===undefined) // parameter was omitted in call
b= 'some default value';
if (typeof(a)==='string')
this._constructInSomeWay(a, b);
else if (a instanceof MyType)
this._const...
What is the use of “ref” for reference-type variables in C#?
...
You can change what foo points to using y:
Foo foo = new Foo("1");
void Bar(ref Foo y)
{
y = new Foo("2");
}
Bar(ref foo);
// foo.Name == "2"
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Why can I type alias functions and use them without casting?
...fmt"
"reflect"
)
type T1 []string
type T2 []string
func main() {
foo0 := []string{}
foo1 := T1{}
foo2 := T2{}
fmt.Println(reflect.TypeOf(foo0))
fmt.Println(reflect.TypeOf(foo1))
fmt.Println(reflect.TypeOf(foo2))
// Output:
// []string
// main.T1
// main...
symbolic link: find all files that link to this file
...depends, if you are trying to find links to a specific file that is called foo.txt, then this is the only good way:
find -L / -samefile path/to/foo.txt
On the other hand, if you are just trying to find links to any file that happens to be named foo.txt, then something like
find / -lname foo.txt
...
Including all the jars in a directory within the Java classpath
...rectory with the extension .jar or .JAR. For example, the
class path entry foo/* specifies all JAR files in the directory named
foo. A classpath entry consisting simply of * expands to a list of all
the jar files in the current directory.
A class path entry that contains * will not match class files...
How to pretty print XML from the command line?
...bxml2-utils
This utility comes with libxml2-utils:
echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
xmllint --format -
Perl's XML::Twig
This command comes with XML::Twig perl module, sometimes xml-twig-tools package:
echo '<root><foo ...
Template default arguments
...
You have to do:
Foo<> me;
The template arguments must be present but you can leave them empty.
Think of it like a function foo with a single default argument. The expression foo won't call it, but foo() will. The argument syntax mus...