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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
... interesting job interview experience a while back. The question started really easy:
47 Answers
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Rails find_or_create_by more than one attribute?
There is a handy dynamic attribute in active-record called find_or_create_by:
5 Answers
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App Inventor 2 AI伴侣有电脑版的吗? - App Inventor 2 中文网 - 清泛网 - 专注C/C++及内核技术
...扰、或商业模拟器安装不了，推荐使用AI2Starter模拟器。
Q & A
Q：AI2Starter模拟器可以调整分辨率吗？
A：可以，通过脚本可调整模拟器分辨率。最新版模拟器使用了三星手机样式，屏幕及分辨率较高。
Q：商业模拟器如何使用...
How to trick an application into thinking its stdout is a terminal, not a pipe
...
Aha!
The script command does what we want...
script --return --quiet -c "[executable string]" /dev/null
Does the trick!
Usage:
script [options] [file]
Make a typescript of a terminal session.
Options:
-a, --append append the output
-c, --command <command> ...
Most efficient way to create a zero filled JavaScript array?
... @PimpTrizkit arr = Array(n) and (arr = []).length = n behave identically according to the spec. In some implementations one could be faster, but I don't think there is a big difference.
– Oriol
Sep 22 '15 at 16:39
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When to wrap quotes around a shell variable?
... quote it if it can either be empty or contain spaces (or any whitespace really) or special characters (wildcards). Not quoting strings with spaces often leads to the shell breaking apart a single argument into many.
$? doesn't need quotes since it's a numeric value. Whether $URL needs it depends o...
App Inventor 2 连接方式：AI伴侣、模拟器、USB · App Inventor 2 中文网
...扰、或商业模拟器安装不了，推荐使用AI2Starter模拟器。
Q & A
Q：AI2Starter模拟器可以调整分辨率吗？
A：可以，通过脚本可调整模拟器分辨率。最新版模拟器使用了三星手机样式，屏幕及分辨率较高。
Q：商业模拟器如何使用...
Elastic Search: how to see the indexed data
...lore your ElasticSearch cluster is to use elasticsearch-head.
You can install it by doing:
cd elasticsearch/
./bin/plugin -install mobz/elasticsearch-head
Then (assuming ElasticSearch is already running on your local machine), open a browser window to:
http://localhost:9200/_plugin/head/
Alte...
Delete directory with files in it?
I wonder, what's the easiest way to delete a directory with all its files in it?
33 Answers
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How to Flatten a Multidimensional Array?
...ition are treated like keys with no values, and because keys have to be unique, where two keys match, your values get added to the same key. A simple solution would be to sort the array first. This is behaviour inherent in PHP.
– Martyn Shutt
Sep 19 '15 at 13:...