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What does “abstract over” mean?
... def add(a: Product, b: Product) = Product(a.value * b.value)
}
val sumOf123 = mapReduce(List(1,2,3), Sum)
val productOf456 = mapReduce(List(4,5,6), Product)
We have abstracted over monoids and foldables.
share
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How do I specify unique constraint for multiple columns in MySQL?
...w surprising/unpleasant it can be. See MySQL bug 25544 bugs.mysql.com/bug.php?id=25544 for a discussion.
– pilcrow
May 7 '10 at 21:41
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中文网（自研/维护）拓展 · App Inventor 2 中文网
...不需要回复的可留空~ 请描述您的问题（300字以内）： 给个鼓励也行呐~o~ 提供截图（仅截取当前可视区域...
Regex to get string between curly braces
... based on the language you work in. Javascript takes the index to stop at, PHP takes the length of the desired end result (unless it's negative, in which case it takes the number of characters to remove), C# is different again...nice and confusing.
– jvenema
Ja...
Match everything except for specified strings
...ems, my @result3 = grep { /\S/ } split /red|green|blue/, $text; (see demo)
php - preg_split('~red|green|blue~', $text) or preg_split('~red|green|blue~', $text, -1, PREG_SPLIT_NO_EMPTY) to output no empty items (see demo)
python - re.split(r'red|green|blue', text) or, to remove empty items, list(filt...
How to split the name string in mysql?
...e me feel super human with mysql pro skills. I have ave completely removed PHP processing and turned 100 lines of logic in a one single query. This is amazing!
– TeaCupApp
Feb 4 '14 at 3:35
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Change text from “Submit” on input tag
...Bnt" type="submit" value="like"/>
name is useful when using $_POST in php and also in javascript as document.getElementByName('submitBnt').
Also you can use name as a CS selector like input[name="submitBnt"];
Hope this helps
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Catch all JavaScript errors and send them to server
...tested Sentry on production and it works fine (JS and other languages like PHP)
1- It's open source (You can install it on your own server)
2- You can use the free plan (100 reports / day)
Or install it on your server: github.com/getsentry
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Can't install RMagick 2.13.1. Can't find MagickWand.h.
...ellar/imagemagick/6.7.5-7/include/ImageMagick/ brew install --fresh -vvvvv php54-imagick
– jeremymarc
Feb 19 '13 at 19:28
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What Ruby IDE do you prefer? [closed]
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I tend to use Aptana exclusively for PHP/Ruby development, and standard Eclipse for JAVA, C, C++ etc. This prevents me from dealing with pointless warnings.
– Zee Spencer
Jun 18 '10 at 14:40
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