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What do all of Scala's symbolic operators mean?
...ou just have to know where to look for them. Or, failing that, look at the index (presently broken on 2.9.1, but available on nightly).
Every Scala code has three automatic imports:
// Not necessarily in this order
import _root_.java.lang._ // _root_ denotes an absolute path
import _root_.sca...
Prefer composition over inheritance?
...
Prefer composition over inheritance as it is more malleable / easy to modify later, but do not use a compose-always approach. With composition, it's easy to change behavior on the fly with Dependency Injection / Setters. Inheritance is more rigid as most languages do not allo...
Relationship between SciPy and NumPy
... contain nothing but the array data type and
the most basic operations: indexing, sorting, reshaping, basic
elementwise functions, et cetera. All numerical code would reside in
SciPy. However, one of NumPy’s important goals is compatibility, so NumPy
tries to retain all features supported...
Solving “Who owns the Zebra” programmatically?
... print key,
for v in sorted(dict(group).keys(), key=variables.index):
print v.ljust(9),
print
if __name__ == '__main__':
solve()
Output:
1 yellow Norwegian cats water Dunhill
2 blue Dane horse tea Blend
3 red ...
How can I create a link to a local file on a locally-run web page?
...a>
These will never open the file in your local applications automatically. That's for security reasons which I'll cover in the last section. If it opens, it will only ever open in the browser. If your browser can display the file, it will, otherwise it will probably ask you if you want to down...
What are the differences between a clustered and a non-clustered index?
What are the differences between a clustered and a non-clustered index ?
12 Answers
...
C++ templates Turing-complete?
..., int N, typename = void>
struct GetItem {
static_assert(N > 0, "index cannot be negative");
static_assert(GetSize<List>::value > 0, "index too high");
typedef typename GetItem<typename List::tail, N-1>::type type;
};
template<typename List>
struct GetItem<...
Most efficient way to create a zero filled JavaScript array?
...(e.g. map or forEach) the values must be set, otherwise it will skip those indexes. The values you set can be whatever you want – even undefined. Example: try new Array(5).forEach(val => console.log('hi')); vs new Array(5).fill(undefined).forEach(val => console.log('hi'));.
...
What does the 'b' character do in front of a string literal?
...x.
So yes, b'...' literals in Python have the same purpose that they do in PHP.
Also, just out of curiosity, are there
more symbols than the b and u that do
other things?
The r prefix creates a raw string (e.g., r'\t' is a backslash + t instead of a tab), and triple quotes '''...''' or """...""" a...
What should every developer know about databases? [closed]
...There's a connection between what I wrote and topics such as Explain Plan, Indexing, and Data Normalization. I'd love to discuss that connection in greater depth in some sort of discussion forum. SO is not such a forum.
– Walter Mitty
Jan 1 '10 at 14:15
...