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How to check whether a file or directory exists?
...xtremely common, idiomatic Go technique. See: golang.org/doc/effective_go.html#errors
– Chris Pfohl
Aug 13 '13 at 20:19
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what is the preferred way to mutate a React state?
... the react docs (https://facebook.github.io/react/docs/state-and-lifecycle.html#state-updates-may-be-asynchronous):
Because this.props and this.state may be updated asynchronously, you should not rely on their values for calculating the next state.
So you should do this instead:
this.setState...
Why did Rails4 drop support for “assets” group in the Gemfile
...ur web server.
(Source: http://edgeguides.rubyonrails.org/asset_pipeline.html#in-production)
But many time you have to use these 'assets' gems in production... for example, if you use a js.coffee file in your views directory, then Rails needs coffee compiler in production mode as well.
So I gue...
css label width not taking effect
...se days, but something to keep in mind. (source quirksmode.org/css/display.html)
– n00dle
May 30 '12 at 13:15
1
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Should I use single or double colon notation for pseudo-elements?
...ector may look reasonable in CSS 2.1.
http://www.w3.org/TR/CSS2/syndata.html#rule-sets
You could however use
.foo:after { /*styles*/ }
.foo::after { /*styles*/ }
On the other hand this is more verbose than necessary; for now, you can stick with the one-colon notation.
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Type hinting a collection of a specified type
... of mypy: http://mail.python.org/pipermail/python-ideas/2014-August/028618.html
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How to extract public key using OpenSSL?
...eygen -y
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html
edit
Thanks @makenova for the complete line:
ssh-keygen -y -f key.pem > key.pub
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How to safely open/close files in python 2.4
... f.closed
True
More here: https://docs.python.org/2/tutorial/inputoutput.html#methods-of-file-objects
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SVG gradient using CSS
...gt;
See an editable example here:
https://jsbin.com/gabuvisuhe/edit?html,css,output
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Best way to make Java's modulus behave like it should with negative numbers?
...176
Using the clock example here, http://mathworld.wolfram.com/Congruence.html
you would not say duration_of_time mod cycle_length is -45 minutes, you would say 15 minutes, even though both answers satisfy the base equation.
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