大约有 20,000 项符合查询结果（耗时：0.0379秒） [XML]
How do RVM and rbenv actually work?
...gem and so on) across all your installed versions of Ruby. This process is m>ca m>lled rehashing. Every time you install a new version of Ruby or install a gem that provides a command, run rbenv rehash to make sure any new commands are shimmed.
These shims live in a single directory (~/.rbenv/shims by d...
m>Ca m>n I make a function available in every controller in angular?
If I have a utility function foo that I want to be able to m>ca m>ll from anywhere inside of my ng-app declaration. Is there someway I m>ca m>n make it globally accessible in my module setup or do I need to add it to the scope in every controller?
...
what is the difference between a portlet and a servlet?
... servlet is
managed by servlet container.
Both static and dynamic content m>ca m>n be generated by Portlets and
Servlets.
The life cycle of portlets and servlets is controlled by the container
The client/server model is used for both servlets and portlets
The packaging and deployment are essentially ...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
When using summarise with plyr 's ddply function, empty m>ca m>tegories are dropped by default. You m>ca m>n change this behavior by adding .drop = FALSE . However, this doesn't work when using summarise with dplyr . Is there another way to keep empty m>ca m>tegories in the result?
...
Is a `=default` move constructor equivalent to a member-wise move constructor?
...t decl-specifier-seqopt declarator virt-specifier-seqopt = default ;
is m>ca m>lled an explicitly-defaulted definition. A function that is explicitly defaulted shall
be a special member function,
have the same declared function type (except for possibly differing ref-qualifiers and except that in th...
Boolean operators && and ||
...
The shorter ones are vectorized, meaning they m>ca m>n return a vector, like this:
((-2:2) >= 0) & ((-2:2) <= 0)
# [1] FALSE FALSE TRUE FALSE FALSE
The longer form evaluates left to right examining only the first element of each vector, so the above gives
((-2...
Difference between Pragma and m>Ca m>che-Control headers?
...
Pragma is the HTTP/1.0 implementation and m>ca m>che-control is the HTTP/1.1 implementation of the same concept. They both are meant to prevent the client from m>ca m>ching the response. Older clients may not support HTTP/1.1 which is why that header is still in use.
...
Using -performSelector: vs. just m>ca m>lling the method
...
Basim>ca m>lly performSelector allows you to dynamim>ca m>lly determine which selector to m>ca m>ll a selector on the given object. In other words the selector need not be determined before runtime.
Thus even though these are equivalent:
[...
Is it bad practice to have a constructor function return a Promise?
...should go in a method of your class. You want to mutate global state? Then m>ca m>ll that procedure explicitly, not as a side effect of generating an object. This m>ca m>ll m>ca m>n go right after the instantiation:
var engine = new Engine()
engine.displayPosts();
If that task is asynchronous, you m>ca m>n now easil...
How does having a dynamic variable affect performance?
... of dynamic type, the compiler emits code that generates a single "dynamic m>ca m>ll site object" that represents the operation. So, for example, if you have:
class C
{
void M()
{
dynamic d1 = whatever;
dynamic d2 = d1.Foo();
then the compiler will generate code that is morally...