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URL matrix parameters vs. query parameters
...ls of resources and sub-resources:
http://example.com/res/categories;name=foo/objects;name=green/?page=1
It really comes down to namespacing.
Note: The 'levels' of resources here are categories and objects.
If only query parameters were used for a multi-level URL, you would end up with
http:...
Serializing class instance to JSON
...thon dict and if your class is simple it will be JSON serializable.
class Foo(object):
def __init__(self):
self.x = 1
self.y = 2
foo = Foo()
s = json.dumps(foo) # raises TypeError with "is not JSON serializable"
s = json.dumps(foo.__dict__) # s set to: {"x":1, "y":2}
The abo...
Difference between \A \z and ^ $ in Ruby regular expressions
...
Difference By Example
/^foo$/ matches any of the following, /\Afoo\z/ does not:
whatever1
foo
whatever2
foo
whatever2
whatever1
foo
/^foo$/ and /\Afoo\z/ all match the following:
foo
...
What are the rules for JavaScript's automatic semicolon insertion (ASI)?
...as a semicolon)
and due to this reason, the classic example of
return
{
foo: 1
}
will not work as expected, because the JavaScript interpreter will treat it as:
return; // returning nothing
{
foo: 1
}
There has to be no line-break immediately after the return:
return {
foo: 1
}
for it t...
How do I determine the size of my array in C?
...
And then you need to send an integer, so you code it up like this:
int foo = 4711;
send(&foo, sizeof (int));
Now, you've introduced a subtle way of shooting yourself in the foot, by specifying the type of foo in two places. If one changes but the other doesn't, the code breaks. Thus, alway...
Really Cheap Command-Line Option Parsing in Ruby
...nd chmod it +x:
$ ./test
./test: Quiet= Interactive=, ARGV=[]
$ ./test -q foo
./test: Quiet=true Interactive=, ARGV=["foo"]
$ ./test -q -i foo bar baz
./test: Quiet=true Interactive=true, ARGV=["foo", "bar", "baz"]
$ ./test -q=very foo
./test: Quiet=very Interactive=, ARGV=["foo"]
See ruby -h for...
What is the purpose of the word 'self'?
...
I like this example:
class A:
foo = []
a, b = A(), A()
a.foo.append(5)
b.foo
ans: [5]
class A:
def __init__(self):
self.foo = []
a, b = A(), A()
a.foo.append(5)
b.foo
ans: []
...
Is there an easy way to pickle a python function (or otherwise serialize its code)?
...s, which can then be reassembled into a function. ie:
import marshal
def foo(x): return x*x
code_string = marshal.dumps(foo.func_code)
Then in the remote process (after transferring code_string):
import marshal, types
code = marshal.loads(code_string)
func = types.FunctionType(code, globals(),...
Connecting overloaded signals and slots in Qt 5
...tOverload and qNonConstOverload).
Usage example (from the docs):
struct Foo {
void overloadedFunction();
void overloadedFunction(int, QString);
};
// requires C++14
qOverload<>(&Foo:overloadedFunction)
qOverload<int, QString>(&Foo:overloadedFunction)
// same, with C+...
Why can't overriding methods throw exceptions broader than the overridden method?
...row that exception or its subclass. For example:
class A {
public void foo() throws IOException {..}
}
class B extends A {
@Override
public void foo() throws SocketException {..} // allowed
@Override
public void foo() throws SQLException {..} // NOT allowed
}
SocketException exte...