大约有 40,000 项符合查询结果（耗时：0.0390秒） [XML]
How does the “this” keyword work?
...ains in JavaScript.
Once you start getting used to this, the rules are actually pretty simple. The ECMAScript 5.1 Standard defines this:
§11.1.1 The this keyword
The this keyword evaluates to the value of the ThisBinding of the current execution context
ThisBinding is something that the JavaScrip...
sed: print only matching group
...uses the entire line to be replaced with the contents of the group
echo "foo bar <foo> bla 1 2 3.4" |
sed -n 's/.*\([0-9][0-9]*[\ \t][0-9.]*[ \t]*$\)/\1/p'
2 3.4
share
|
improve this answ...
Is there a performance gain in using single quotes vs double quotes in ruby?
...t waste your time.
Actual interpolation is a different story, of course. 'foo' will be almost exactly 1 second faster than "#{sleep 1; nil}foo".
share
|
improve this answer
|
...
How to add reference to a method parameter in javadoc?
...ding the docs for javadoc there is no such feature.
Don't use <code>foo</code> as recommended in other answers; you can use {@code foo}. This is especially good to know when you refer to a generic type such as {@code Iterator<String>} -- sure looks nicer than <code>Iterator...
Overload constructor for Scala's Case Classes?
...
Overloading constructors isn't special for case classes:
case class Foo(bar: Int, baz: Int) {
def this(bar: Int) = this(bar, 0)
}
new Foo(1, 2)
new Foo(1)
However, you may like to also overload the apply method in the companion object, which is called when you omit new.
object Foo {
d...
Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won't deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be P...
How do I get the parent directory in Python?
...that does nothing but string manipulation. To verify if the pathname actually exist requires a disk access. Depends on the application this may or may not be desirable.
– Wai Yip Tung
May 18 '10 at 19:45
...
Object-orientation in C
... describes it.
Exception in C is a C89 implementation of the TRY-CATCH-FINALLY found in other OO languages. It comes with a testsuite and some examples.
Both by Laurent Deniau, which is working a lot on OOP in C.
share
...
For loop example in MySQL
...
drop table if exists foo;
create table foo
(
id int unsigned not null auto_increment primary key,
val smallint unsigned not null default 0
)
engine=innodb;
drop procedure if exists load_foo_test_data;
delimiter #
create procedure load_foo_test_...
How can I get the full object in Node.js's console.log(), rather than '[Object]'?
...console.log(obj) it still prints [Object] for deeply nested objects :( I really wish it would behave as you describe.
– SSH This
Feb 23 '16 at 22:36
53
...