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Why use multiple columns as primary keys (composite primary key)
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edited Aug 29 '17 at 10:15
Vadim Ovchinnikov
9,92644 gold badges3939 silver badges6969 bronze badges
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How to trim whitespace from a Bash variable?
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1050
Let's define a variable containing leading, trailing, and intermediate whitespace:
FOO=' tes...
What is an NP-complete in computer science?
..., I apologize.
– Aryabhatta
May 20 '10 at 17:44
33
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Check if Python Package is installed
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109
If you mean a python script, just do something like this:
Python 3.3+ use sys.modules and find...
What is the difference between integration and unit tests?
... is the sole responsibility for that method.
Also, suppose Log is used in 100 other features, in 100 other methods of 100 other classes.
Yep, 100 features will fail. But, fortunately, 100 end-to-end tests are failing as well and revealing the problem. And, yes: they are telling the truth.
It's ve...
How to install pip with Python 3?
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10
Pip's website says that it already comes with Python 3.4+ if you downloaded from python.org. However, when I type pip on terminal, I get co...
How do I vertically align something inside a span tag?
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answered Apr 9 '09 at 2:10
Sindre SorhusSindre Sorhus
62.6k3030 gold badges151151 silver badges207207 bronze badges
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Base64 encoding and decoding in client-side Javascript
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Some browsers such as Firefox, Chrome, Safari, Opera and IE10+ can handle Base64 natively. Take a look at this Stackoverflow question. It's using btoa() and atob() functions.
For server-side JavaScript (Node), you can use Buffers to decode.
If you are going for a cross-browser solu...
Why are ToLookup and GroupBy different?
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10
Eagerness explains it. The language of 'ToMetaType' I think implies eagerness; though it is obviously left up to the implementation. The ot...
Rails extending ActiveRecord::Base
...ass_methods do
#E.g: Order.top_ten
def top_ten
limit(10)
end
end
end
# include the extension
ActiveRecord::Base.send(:include, ActiveRecordExtension)
Create a file in the config/initializers directory called extensions.rb and add the following line to the file:
requi...