大约有 31,500 项符合查询结果（耗时：0.0610秒） [XML]
JavaScript: How to pass object by value?
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Not really.
Depending on what you actually need, one possibility may be to set o as the prototype of a new object.
var o = {};
(function(x){
var obj = Object.create( x );
obj.foo = 'foo';
obj.bar = 'bar';
})(o);
aler...
What is your favorite C programming trick? [closed]
...
C99 offers some really cool stuff using anonymous arrays:
Removing pointless variables
{
int yes=1;
setsockopt(yourSocket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
}
becomes
setsockopt(yourSocket, SOL_SOCKET, SO_REUSEADDR...
How to get the host name of the current machine as defined in the Ansible hosts file?
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The necessary variable is inventory_hostname.
- name: Install this only for local dev machine
pip: name=pyramid
when: inventory_hostname == "local"
It is somewhat hidden in the documentation at the bottom of this section.
...
What is JavaScript's highest integer value that a number can go to without losing precision?
...egers exactly and to correctly compare them.
From the spec:
Note that all the positive and negative integers whose magnitude is no
greater than 253 are representable in the Number type (indeed, the
integer 0 has two representations, +0 and -0).
To safely use integers larger than this, you...
LINQ to Entities case sensitive comparison
...ObjectQuery.ToTraceString to see the generated SQL query that has been actually submitted to SQL Server reveals the mystery:
string sqlQuery = ((ObjectQuery)context.Thingies
.Where(t => t.Name == "ThingamaBob")).ToTraceString();
When you create a LINQ to Entities query, LINQ to Entities ...
How to delete a file or folder?
...mdir() removes an empty directory.
shutil.rmtree() deletes a directory and all its contents.
Path objects from the Python 3.4+ pathlib module also expose these instance methods:
pathlib.Path.unlink() removes a file or symbolic link.
pathlib.Path.rmdir() removes an empty directory.
...
Adding Xcode Workspace Schemes to Version Control
...ce Schemes that I've created with the other team members. However they are all stored under .xcodeproj > xcuserdata > .xcuserdatad > xcschemes. I've set xcuserdata folders to be ignore in SVN as I assumed all data in that folder were user specific.
...
Is there still any reason to learn AWK?
...Good Thing. The only other scripting environment that can be found on virtually every *nix is sh. So while grep, sed, etc can surely replace awk on a modern mainstream linux distro, when you move to more exotic systems, knowing a little awk is going to be Real Handy.
awk can also be used for more t...
Fastest way to convert string to integer in PHP
... 0.42208
intval("hello"): 0.93678 (222%)
On average, calling intval() is two and a half times slower, and the difference is the greatest if your input already is an integer.
I'd be interested to know why though.
Update: I've run the tests again, this time with coercion (0 + ...
Java Hashmap: How to get key from value?
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The BidiMap interface in the Collections library is a bi-directional map, allowing you to map a key to a value (like normal maps), and also to map a value to a key, thus allowing you to perform lookups in both directions. Obtaining a key for a value is supported by the getKey() method.
There is a ...