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What's the pythonic way to use getters and setters?
...
print("deleter of x called")
del self._x
c = C()
c.x = 'foo' # setter called
foo = c.x # getter called
del c.x # deleter called
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return, return None, and no return at all?
...be present at the end of the function
(if reachable).
Yes:
def foo(x):
if x >= 0:
return math.sqrt(x)
else:
return None
def bar(x):
if x < 0:
return None
return math.sqrt(x)
No:
def foo(x):
if x >= 0:
return math.sq...
Resolving ambiguous overload on function pointer and std::function for a lambda using +
In the following code, the first call to foo is ambiguous, and therefore fails to compile.
1 Answer
...
Find and replace - Add carriage return OR Newline
...e last steps.
Example
For example, if you want to replace this:
public IFoo SomeField { get { return this.SomeField; } }
with that:
public IFoo Foo { get { return this.MyFoo; } }
public IBar Bar { get { return this.MyBar; } }
You would do the following substitutions:
public IFoo SomeField ...
Html code as IFRAME source rather than a URL
...string of HTML. For example, the following HTML:
<html><body>foo</body></html>
can be encoded as this:
data:text/html;charset=utf-8,%3Chtml%3E%3Cbody%3Efoo%3C/body%3E%3C/html%3E
and then set as the src attribute of the iframe. Example.
Edit: The other alternative i...
querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...rs.
e.g. All list items descended from an element that is a member of the foo class: .foo li
document.querySelector("#view:_id1:inputText1") it doesn't work. But writing document.getElementById("view:_id1:inputText1") works. Any ideas why?
The : character has special meaning inside a selector...
LINQ OrderBy versus ThenBy
... will effectively be the dominant one. You can (in LINQ to Objects) write
foo.OrderBy(x).OrderBy(y).OrderBy(z)
which would be equivalent to
foo.OrderBy(z).ThenBy(y).ThenBy(x)
as the sort order is stable, but you absolutely shouldn't:
It's hard to read
It doesn't perform well (because it reor...
Best way of invoking getter by reflection
...import java.beans.*
for (PropertyDescriptor pd : Introspector.getBeanInfo(Foo.class).getPropertyDescriptors()) {
if (pd.getReadMethod() != null && !"class".equals(pd.getName()))
System.out.println(pd.getReadMethod().invoke(foo));
}
Note that you could create BeanInfo or PropertyDesc...
Create RegExps on the fly using string variables
...you can implement global string replacement with RegExp:
function replace_foo(target, string_to_replace, replacement) {
var relit= escapeRegExp(string_to_replace);
var sub= escapeSubstitute(replacement);
var re= new RegExp(relit, 'g');
return target.replace(re, sub);
}
What a pain...
How do I write a short literal in C++?
...n -Wconversion you still get a compiler diagnostic for the statement short foo = 1; foo += (short)2;. But this can't be circumvented due to the integer promotion.
– harper
Jan 27 '14 at 11:44
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