大约有 7,000 项符合查询结果（耗时：0.0322秒） [XML]
Determine the data types of a data frame's columns
...
I would suggest
sapply(foo, typeof)
if you need the actual types of the vectors in the data frame. class() is somewhat of a different beast.
If you don't need to get this information as a vector (i.e. you don't need it to do something else progr...
Javascript objects: get parent [duplicate]
...e references to the same object.
You could also do:
var obj = { subObj: {foo: 'hello world'} };
var obj2 = {};
obj2.subObj = obj.subObj;
var s = obj.subObj;
You now have three references, obj.subObj, obj2.subObj, and s, to the same object. None of them is special.
...
Lambda capture as const reference?
...ly this doesn't apply when capturing a member-variable by reference: [&foo = this->foo] inside of a const function gives me an error stating that the capture itself discards qualifiers. This could be a bug in GCC 5.1, though, I suppose.
– Kyle Strand
Apr...
How to get the caller's method name in the called method?
...
return inner
return wrapper
Use:
@print_caller_name(4)
def foo():
return 'foobar'
def bar():
return foo()
def baz():
return bar()
def fizz():
return baz()
fizz()
output is
level : module : name
------------------------------------------...
Why can't code inside unit tests find bundle resources?
...e bundleForClass:[self class]];
NSString *path = [bundle pathForResource:@"foo" ofType:@"txt"];
Then your code will search the bundle that your unit test class is in, and everything will be fine.
share
|
...
What is the most elegant way to remove a path from the $PATH variable in Bash?
...he second case it adds ` ` as a path element.
– Fred Foo
Mar 13 '11 at 17:26
1
@larsmans: Works f...
How do I call the default deserializer from a custom deserializer in Jackson
...t to read to retrieve the JsonParser to pass to readValue().
public class FooDeserializer extends StdDeserializer<FooBean> {
private static final long serialVersionUID = 1L;
public FooDeserializer() {
this(null);
}
public FooDeserializer(Class<FooBean> t) {
...
Range references instead values
...ay [10]MyType
for idx, _ := range array {
array[idx].field = "foo"
}
for _, e := range array {
fmt.Println(e.field)
fmt.Println("--")
}
}
share
|
improve t...
Test if a property is available on a dynamic variable
...before checking.
dynamic test = new System.Dynamic.ExpandoObject();
test.foo = "bar";
if (((IDictionary<string, object>)test).ContainsKey("foo"))
{
Console.WriteLine(test.foo);
}
share
|
...
Throw keyword in function's signature
... the above link works or not.
class MyClass
{
size_t CalculateFoo()
{
:
:
};
size_t MethodThatCannotThrow() throw()
{
return 100;
};
void ExampleMethod()
{
size_t foo, bar;
try
{
foo = CalculateFoo()...