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Does JavaScript have a method like “range()” to generate a range within the supplied bounds?
...1).keys()].map(i => i + 'A'.charCodeAt(0)));
=> "ABCD"
Iteration
for (const x of Array(5).keys()) {
console.log(x, String.fromCharCode('A'.charCodeAt(0) + x));
}
=> 0,"A" 1,"B" 2,"C" 3,"D" 4,"E"
As functions
function range(size, startAt = 0) {
return [...Array(size).keys()].ma...
Match multiple cases classes in scala
...println(aString)"? Seems like as long as the type of aString is identical for both A and B, it should be allowed. Your last example seems like it would be better off not duplicating the B and C cases.
– James Moore
Nov 9 '11 at 1:18
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How to write to a file, using the logging Python module?
...ame,
filemode='a',
format='%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s',
datefmt='%H:%M:%S',
level=logging.DEBUG)
logging.info("Running Urban Planning")
self.logger = loggin...
How can I create directory tree in C++/Linux?
...
#include <string.h>
/* "sysstat.h" == <sys/stat.h> with fixup for (old) Windows - inc mode_t */
#include "sysstat.h"
typedef struct stat Stat;
static int do_mkdir(const char *path, mode_t mode)
{
Stat st;
int status = 0;
if (stat(path, &st) != 0...
Is there a typical state machine implementation pattern?
...tement the best way to go?
We have a current state (state) and a trigger for the transition.
19 Answers
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Two way/reverse map [duplicate]
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@SudhirJonathan: You can go much further with this idea--for instance, add an .add method so that you can do things like d.add('Bob', 'Alice') instead of using the syntax I showed. I would also include some error handling. But you get the basic idea. :)
– Sash...
Finding a substring within a list in Python [duplicate]
...
print [s for s in list if sub in s]
If you want them separated by newlines:
print "\n".join(s for s in list if sub in s)
Full example, with case insensitivity:
mylist = ['abc123', 'def456', 'ghi789', 'ABC987', 'aBc654']
sub = 'a...
Queries vs. Filters
...fference is simple: filters are cached and don't influence the score, therefore faster than queries. Have a look here too. Let's say a query is usually something that the users type and pretty much unpredictable, while filters help users narrowing down the search results , for example using facets.
...
What is the JavaScript equivalent of var_dump or print_r in PHP? [duplicate]
I would like to see the structure of object in JavaScript (for debugging). Is there anything similar to var_dump in PHP?
9 ...
How do I parallelize a simple Python loop?
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Using multiple threads on CPython won't give you better performance for pure-Python code due to the global interpreter lock (GIL). I suggest using the multiprocessing module instead:
pool = multiprocessing.Pool(4)
out1, out2, out3 = zip(*pool.map(calc_stuff, range(0, 10 * offset, o...