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Simplest code for array intersection in javascript
...ersection = new Set([...setA].filter(x => setB.has(x)));
return Array.from(intersection);
}
Shorter, but less readable (also without creating the additional intersection Set):
function intersect(a, b) {
var setB = new Set(b);
return [...new Set(a)].filter(x => setB.has(x));
}
Note t...
How can I tell Rails to use RSpec instead of test-unit when creating a new Rails app?
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Can you edit the code from g.test_framework = :rspec to g.test_framework :rspec
– Deepak Lamichhane
Jul 2 '13 at 10:23
8
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join list of lists in python [duplicate]
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import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))
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Android AsyncTask threads limits?
... database in the phone. For all those operations (updates, retrieving data from db and etc.) I use async tasks. As up till now I didn't see why I shouldn't use them, but recently I experienced that if I do some operations some of my async tasks simply stop on pre-execute and don't jump to doInBackgr...
Fastest way to determine if an integer's square root is an integer
...the classical way.
// The correctness is not trivial as the conversion from long to double is lossy!
final long tst = (long) Math.sqrt(x);
return tst * tst == x;
}
The first test catches most non-squares quickly. It uses a 64-item table packed in a long, so there's no array access cost ...
List goals/targets in GNU make that contain variables in their definition
...ge makefile that creates a number of targets on the fly by computing names from variables. (eg foo$(VAR) : $(PREREQS)). Is there any way that gnu make can be convinced to spit out a list of targets after it has expanded these variables?
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Python string class like StringBuilder in C#?
...gs that fulfill similar purposes:
One common way to build large strings from pieces is to grow a list of strings and join it when you are done. This is a frequently-used Python idiom.
To build strings incorporating data with formatting, you would do the formatting separately.
For insertion an...
How should I choose an authentication library for CodeIgniter? [closed]
... and simple to integrate with CodeIgniter
Supports sending emails directly from the library
Well documented online and good active dev/user community
Simple to implement into a project
Cons
More complex DB schema than some others
Documentation lacks detail in some areas
SimpleLoginSecure
Pros
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Determine command line working directory when running node bin script
...urns absolute path to directory of __filename.
If you need to load files from your module directory you need to use relative paths.
require('../lib/test');
instead of
var lib = path.join(path.dirname(fs.realpathSync(__filename)), '../lib');
require(lib + '/test');
It's always relative to ...
How to reference a file for variables using Bash?
.../usr/bin/env bash
source config.sh
echo $production
Note that the output from sh ./script.sh in this example is:
~$ sh ./script.sh
playschool_joe
liveschool_joe
This is because the source command actually runs the program. Everything in config.sh is executed.
Another way
You could use th...