大约有 7,000 项符合查询结果（耗时：0.0212秒） [XML]
What does ||= (or-equals) mean in Ruby?
.... For example:
a ||= nil # => nil
a ||= 0 # => 0
a ||= 2 # => 0
foo = false # => false
foo ||= true # => true
foo ||= false # => true
Confusingly, it looks similar to other assignment operators (such as +=), but behaves differently.
a += b translates to a = a + b
a ||= b roug...
Why can't C# interfaces contain fields?
...he runtime how to fill in all the required slots. When you say
interface IFoo { void M(); }
class Foo : IFoo { public void M() { ... } }
the class says "when you create an instance of me, stuff a reference to Foo.M in the slot for IFoo.M.
Then when you do a call:
IFoo ifoo = new Foo();
ifoo....
How to Correctly Use Lists in R?
.... Here's a simple example:
> library(hash)
> h <- hash( keys=c('foo','bar','baz'), values=1:3 )
> h[c('foo','bar')]
<hash> containing 2 key-value pairs.
bar : 2
foo : 1
In terms of usability, the hash class is very similar to a list. But the performance is better for large...
Is it possible to create a remote repo on GitHub from the CLI without opening browser?
...hub && ./script/build
Go to your repo or create empty one: mkdir foo && cd foo && git init.
Run: hub create, it'll ask you about GitHub credentials for the first time.
Usage: hub create [-p] [-d DESCRIPTION] [-h HOMEPAGE] [NAME]
Example: hub create -d Description -h examp...
How can I exclude directories from grep -R?
...busybox or GNU version older than 2.5.
Use find, for excluding directories foo and bar :
find /dir \( -name foo -prune \) -o \( -name bar -prune \) -o -name "*.sh" -print
Then combine find and the non-recursive use of grep, as a portable solution :
find /dir \( -name node_modules -prune \) -o -name...
How to replace a character by a newline in Vim
...
In the syntax s/foo/bar, \r and \n have different meanings, depending on context.
Short:
For foo:
\r == "carriage return" (CR / ^M)
\n == matches "line feed" (LF) on Linux/Mac, and CRLF on Windows
For bar:
\r == produces LF on Linux/Mac, CR...
How to add test coverage to a private constructor?
...tion, InvocationTargetException, InstantiationException {
Constructor<Foo> constructor = Foo.class.getDeclaredConstructor();
assertTrue(Modifier.isPrivate(constructor.getModifiers()));
constructor.setAccessible(true);
constructor.newInstance();
}
...
How do I use the lines of a file as arguments of a command?
Say, I have a file foo.txt specifying N arguments
10 Answers
10
...
How to initialize all members of an array to the same value?
...designated initialisers. If you statically initialise 65536 ints, like int foo1 = 1, foo2 = 1, ..., foo65536 =1; you will get the same size increase.
– qrdl
Mar 29 '13 at 20:48
28
...
What's the best mock framework for Java? [closed]
... class ExpecationsTest {
private MyClass obj;
@Test
public void testFoo() {
new Expectations(true) {
MyClass c;
{
obj = c;
invokeReturning(c.getFoo("foo", false), "bas");
}
};
assert "bas".equals(obj.getFoo("foo", false));
Expectations.asser...