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How to initialize an array's length in JavaScript?
...> {
return Array(8).fill(null).map((y, i) => {
return `${String.fromCharCode(65 + i)}${8 - j}`;
});
});
// [ [A8, B8, C8, D8, E8, F8, G8, H8],
// [A7, B7, C7, D7, E7, F7, G7, H7],
// [A6, B6, C6, D6, E6, F6, G6, H6],
// [A5, B5, C5, D5, E5, F5, G5, H5],
// [A4, B4, C4,...
Cartesian product of multiple arrays in JavaScript
...S
Original 2017 Answer: 2-line answer with vanilla JS:
(see updates below)
All of the answers here are overly complicated, most of them take 20 lines of code or even more.
This example uses just two lines of vanilla JavaScript, no lodash, underscore or other libraries:
let f = (a, b) => [].concat...
How to extract the n-th elements from a list of tuples?
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@Wayne Werner: Yep. This stuff was all just passive knowledge (I don't often use it) - but it's good to be reminded now and then so you know where / what to look for...
– Daren Thomas
Jul 22 '10 at 13:14
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How can I use redis with Django?
...o-redis for django cache backend.
Django-redis build on redis-py and added extra features related to django application.
Django-redis doc Github
Other libraries also exists.
Redis use cases and data types
Some use cases
Session cache
Real time analytics
Web caching
Leaderboards
Top Redis Use Case...
Why does @foo.setter in Python not work for me?
So, I'm playing with decorators in Python 2.6, and I'm having some trouble getting them to work. Here is my class file:
4 A...
Priority queue in .Net [closed]
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I like using the OrderedBag and OrderedSet classes in PowerCollections as priority queues.
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Impossible to Install PG gem on my mac with Mavericks
I'm trying to install the pg gem in order to work again with my rails projects. But I get this error:
26 Answers
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C99 stdint.h header and MS Visual Studio
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And to use literal uint64_t values it is useful to #define U64(u) (u##ui64) on Windows and to #define U64(u) (u##ULL) otherwise.
– Niklas
Aug 14 '13 at 11:12
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Concurrent.futures vs Multiprocessing in Python 3
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I wouldn't call concurrent.futures more "advanced" - it's a simpler interface that works very much the same regardless of whether you use multiple threads or multiple processes as the underlying parallelization gimmick.
So, like virtuall...
Understanding generators in Python
...A generator is simply a function which returns an object on which you can call next, such that for every call it returns some value, until it raises a StopIteration exception, signaling that all values have been generated. Such an object is called an iterator.
Normal functions return a single value...