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How to mount a host directory in a Docker container
...x.
According to Docker documentation, the appropriate command to mount is now mount instead of -v. Here's its documentation:
--mount: Consists of multiple key-value pairs, separated by commas. Each key/value pair takes the form of a <key>=<value> tuple. The --mount syntax is more verb...
How to map and remove nil values in Ruby
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Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.ev...
How can I reverse the order of lines in a file?
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There's the well-known sed tricks:
# reverse order of lines (emulates "tac")
# bug/feature in HHsed v1.5 causes blank lines to be deleted
sed '1!G;h;$!d' # method 1
sed -n '1!G;h;$p' # method 2
(Explanation: prepen...
What underlies this JavaScript idiom: var self = this?
...in event handlers (especially in closures).
Edit: Note that using self is now discouraged as window.self exists and has the potential to cause errors if you are not careful.
What you call the variable doesn't particularly matter. var that = this; is fine, but there's nothing magic about the name....
Two divs side by side - Fluid display
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It is not helping, the zooming thing is fixed now, it says fixed, but the right div is now slided down and fixed at that position
– Waleed
Jun 20 '13 at 15:51
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ArrayIndexOutOfBoundsException when using the ArrayList's iterator
Right now, I have a program containing a piece of code that looks like this:
8 Answers
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Opening the Settings app from another app
Okay, I know that there are many question about it, but they are all from many time ago.
17 Answers
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Visual Studio debugging/loading very slow
...al Studio from remotely querying the Microsoft servers.
Click "OK".
From now on, symbol loading should be much faster.
Note that if you make any changes/downloads to Microsoft assemblies, you may need to go back into the Symbols dialog box and "Load all symbols" again.
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:active pseudo-class doesn't work in mobile safari
...-color: rgba(0,0,0,0);">
Testing Touch on iOS
</button>
Now when the button is tapped and held on iOS, the button changes to the specified color without the surrounding transparent gray color appearing.
In other words, setting an ontouchstart event (even if it's empty) is explic...
scrollIntoView Scrolls just too far
...e wrong direction so all I had to do was change it from += 10 to -= 10 and now it's loading just right, thanks a lot for the help!!!!
– Matthew Wilson
Jul 10 '14 at 1:38
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