大约有 6,261 项符合查询结果（耗时：0.0125秒） [XML]
Dynamic constant assignment
...ject itself is different each time the method is called. For example:
def foo
p "bar".object_id
end
foo #=> 15779172
foo #=> 15779112
Perhaps if you explained your use case—why you want to change the value of a constant in a method—we could help you with a better implementation.
Per...
Operation on every pair of element in a list
...
my_list = [1,2,3,4]
for pair in itertools.product(my_list, repeat=2):
foo(*pair)
This is equivalent to:
my_list = [1,2,3,4]
for x in my_list:
for y in my_list:
foo(x, y)
Edit: There are two very similar functions as well, permutations() and combinations(). To illustrate how th...
Convert a string to regular expression ruby
...
"/[\w\s]+/".to_regexp => /[\w\s]+/
You also can use the modifier:
'/foo/i'.to_regexp => /foo/i
Finally, you can be more lazy using :detect
'foo'.to_regexp(detect: true) #=> /foo/
'foo\b'.to_regexp(detect: true) #=> %r{foo\\b}
'/foo\b/'.to_regexp(detect: true) #=> %r{f...
What is this weird colon-member (“ : ”) syntax in the constructor?
...tax (ala: new String("Name")). It fits in with the constructor better than Foo(int num) : m_Count = 5. Not to mention that classes must be constructed at this point anyway, since it's initialized here. Foo(int num) : Bar = num, wouldn't compile right. It just seems weird seeing Foo(int num) : m_Coun...
Mixins vs. Traits
...s (MA and MB) or traits (TA and TB) define method with the same definition foo():void.
Mixin MA {
foo():void {
print 'hello'
}
}
Mixin MB {
foo():void {
print 'bye'
}
}
Trait TA {
foo():void {
print 'hello'
}
}
Trait TB {
foo():void {
p...
Convert Go map to json
...arshal(datas)
fmt.Println(err)
// [] json: unsupported type: map[int]main.Foo
The thing is you cannot use integers as keys in JSON; it is forbidden. Instead, you can convert these values to strings beforehand, for instance using strconv.Itoa.
See this post for more details: https://stackoverflow...
mkdir -p functionality in Python [duplicate]
... What about distutils.dir_util.mkpath? It's pretty simple as mkpath('./foo/bar')
– auraham
Jan 15 '13 at 21:41
...
How do you use the Immediate Window in Visual Studio?
...r example, let’s say this is what your class looks like:
private class Foo
{
public string GetMessage()
{
return "hello";
}
}
If the object already exists in memory and it’s in scope, then you can call it in the Immediate Window as long as it has been instantiated before ...
Is it bad practice to make a setter return “this”?
...otherwise! (because it avoids redundant clutter of repeating code like bla.foo.setBar1(...) ; bla.foo.setBar2(...) when you could write bla.foo /* newline indented */.setBar1(...) /* underneath previous setter */ .setBar2(...) (can't use linebreaks in a SO comment like this :-( ... hope you get the ...
How do I make class methods / properties in Swift?
...operties and type methods and you use the class or static keywords.
class Foo {
var name: String? // instance property
static var all = [Foo]() // static type property
class var comp: Int { // computed type property
return 42
}
class func alert() { ...