大约有 3,378 项符合查询结果（耗时：0.0241秒） [XML]
Why is rbindlist “better” than rbind?
...frame(a=1:3); .Internal(inspect(DF)); tracemem(DF); attr(DF,"test") <- "hello"; .Internal(inspect(DF)).
– Matt Dowle
Mar 28 '13 at 13:38
4
...
What is Node.js' Connect, Express and “middleware”?
...eServer(function (request, response) {
// respond
response.write('hello client!');
response.end();
});
server.listen(3000);
What connect adds
Middleware is basically any software that sits between your application code and some low level API. Connect extends the built-in HTTP serve...
return statement vs exit() in main()
...#include <stdio.h>
#include <stdlib.h>
int main() {
printf("Hello, World!\n");
exit(EXIT_SUCCESS); /* to get good return value to OS */
/*NOTREACHED*/ /* to silence lint warning */
return 0; /* to silence compiler warning */
}
Aside: If I recall correctly, the VMS conventio...
Python's many ways of string formatting — are the older ones (going to be) deprecated?
...pproach of the old % formatter:
"{greeting}, {0}".format(world, greeting='Hello')
and is extensible through the object.__format__() hook used to handle formatting of individual values.
Note that the old system had % and the Template class, where the latter allows you to create subclasses that ad...
How to perform Callbacks in Objective-C
...tring *))callback {
// Return a message to the callback
callback(@"Hello to you too!");
}
@end
[Robot sayHi:^(NSString *reply){
NSLog(@"%@", reply);
}];
There's always F****ng Block Syntax if you ever forget Objective-C's Block syntax.
...
Apache and Node.js on the Same Server
...q, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Apache!\n');
}).listen(8000, '127.0.0.1');
Then you can access all Node.JS logic using the /node/ path on your url, the rest of the website can be left to Apache to host your existing PHP pages:
Now the only thing ...
Compiling dynamic HTML strings from database
...
Hello, If I use element.html it return me TypeError: Cannot call method 'insertBefore' of null. So after some googling about that I find that I must use element.append But If I use that directive on multiple places - it gener...
What does passport.session() middleware do?
...
Hello @JaredHanson Could you take a look at this. I couldn't find the answer anywhere?
– Saras Arya
Dec 10 '15 at 19:56
...
Relatively position an element without it taking up space in document flow
...gt;
<div class="col-md-12">
<h3> hello </h3>
</div>
<div class="col-md-12">
<span> whats up? </span>
</div>
<div style="height:0" class="col-md-12">...
What is Type-safe?
...
The compiler will then stop me from doing this:
// call foo
foo("hello world")
In other languages, the compiler would not stop me (or there is no compiler...), so the string would be passed to the logic and then probably something bad will happen.
Type safe languages try to catch more a...