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Disabling swap files creation in vim
...data maybe 5 times. But I have been hassled to recover a swapfile about 9,000 times, which is invariably identical to the file anyway, or worse an out-of-date version. It might be a good feature if the recovery process didn't suck so terribly. recover.vim helps a little, but is still too interact...
Where can I find documentation on formatting a date in JavaScript?
...totype.toisostring
new Date().toISOString(); // e.g. "2016-11-21T08:00:00.000Z"
toJSON: Stringifier for JSON.
http://www.ecma-international.org/ecma-262/7.0/index.html#sec-date.prototype.tojson
new Date().toJSON(); // e.g. "2016-11-21T08:00:00.000Z"
toLocaleDateString: Implem...
Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT
... create table innodb_table(`id` int(10) unsigned NOT NULL);
ERROR 1813 (HY000): Tablespace for table '`database_name`.`innodb_table`' exists. Please DISCARD the tablespace before IMPORT
in order to fix this, what i did was first
create table innodb_table2(`id` int(10) unsigned NOT NULL);
Query...
SQL Server : Columns to Rows
...me that xml is about 2.5 times slower that dynamic (it was one query on ~250000 rows table, so this estimate is no way exact). You could compare it yourself if you want, here's sqlfiddle example, on 100000 rows it was 29s (xml) vs 14s (dynamic);
may be it could be harder to understand for people not...
Check if a Postgres JSON array contains a string
...te: Here's a demonstration of the performance improvements on a table of 1,000,000 rabbits where each rabbit likes two foods and 10% of them like carrots:
d=# -- Postgres 9.3 solution
d=# explain analyze select info->>'name' from rabbits where exists (
d(# select 1 from json_array_elements(in...
How to get all possible combinations of a list’s elements?
... you pick all elements corresponding to a "1".
items=abc * mask=###
|
V
000 ->
001 -> c
010 -> b
011 -> bc
100 -> a
101 -> a c
110 -> ab
111 -> abc
Things to consider:
This requires that you can call len(...) on items (workaround: if items is something like an ite...
What are the benefits of functional programming? [closed]
...n numbers". Such an array is infinitely large, but you can ask for the 100,000th element of that array at any moment without having to know--at array initialization time--just what the largest value is you're going to need. The value will be calculated only when you need it, and no further.
...
How would you implement an LRU cache in Java?
... );
cache.put ( 3, 3 );
for (int index =0 ; index < 5_000; index++) {
cache.get(0);
cache.get ( 1 );
cache.put ( 2, index );
cache.put ( 3, index );
cache.put(index, index);
}
boolean ok = cache.getSil...
Why does C++ not have reflection?
...sts $2.00, rather than one that costs $2.50, and if the code is going in 1,000,000 units, eliminating that code can save $500,000. Without reflection, static analysis can often identify 90%+ of unreachable code; if Reflection is allowed, anything that can be reached via Reflection must be presumed ...
Plurality in user messages
... Probably apocryphal, but many years back I read that Lotus had shipped 40,000 units of Lotus Notes for the Mac and 60,000 were returned. The interface was so bad that even the people who had pirated it sent it back.
– Duncan
Nov 24 '10 at 2:38
...