大约有 45,000 项符合查询结果（耗时：0.0856秒） [XML]
Email validation using jQuery
...n this regex may need modifying .systems and .poker etc are all valid TLDs now but would fail the regex check
– Liath
Sep 5 '14 at 7:35
3
...
When should I use nil and NULL in Objective-C?
...
This accepted answer fails to acknowledge that [NSNull null] is a very different beast. To quote from NSNull Class Reference, "The NSNull class defines a singleton object used to represent null values in collection objects (which don’t allow nil values)." ...
What's the yield keyword in JavaScript?
...
Late answering, probably everybody knows about yield now, but some better documentation has come along.
Adapting an example from "Javascript's Future: Generators" by James Long for the official Harmony standard:
function * foo(x) {
while (true) {
...
Using property() on classmethods
... """access the class's property"""
return type(self).foo
And now we see both the instance
>>> FooClassProperty().foo
<class '__main__.FooClassProperty'>
and the class
>>> FooClassProperty.foo
<class '__main__.FooClassProperty'>
have access to the class p...
How to pass arguments to a Button command in Tkinter?
...arameter assignment for the lambda"? I did not get lambda to work and thus now use partial.
– Klamer Schutte
Feb 18 '15 at 22:14
|
show 13 m...
Dynamically set local variable [duplicate]
...Function locals can be optimised for speed because the compiler (usually) knows all the names in advance, so there isn't a dictionary until you call locals().
In the C implementation of Python locals() (called from inside a function) creates an ordinary dictionary initialised from the current value...
How to remove constraints from my MySQL table?
...column to other tables columns. Mine had a standard name given to it. Also now I now that you can drop foreign keys safetely without the column itself being dropped
– Lealo
Aug 18 '17 at 0:35
...
How can I open multiple files using “with open” in Python?
...asks. No duplicate writing or failing to write. So I am really curious to know why my answer is considered to be wrong, suboptimal or anything like that.
share
|
improve this answer
|
...
Conveniently Declaring Compile-Time Strings in C++
...nything to match the elegance of Scott Schurr's str_const presented at C++ Now 2012. It does require constexpr though.
Here's how you can use it, and what it can do:
int
main()
{
constexpr str_const my_string = "Hello, world!";
static_assert(my_string.size() == 13, "");
static_assert(...
Declare and initialize a Dictionary in Typescript
... true;
}
toLookup(): IDictionary {
return this;
}
}
Now we declare the Person specific type and Dictionary/Dictionary interface. In the PersonDictionary note how we override values() and toLookup() to return the correct types.
interface IPerson {
firstName: string;
la...