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Where are Docker images stored on the host machine?
... is still running in a VM, the system paths are relative to the VM and not from the Mac Osx system. Try this command : docker run --rm -it -v /:/vm-root alpine:edge ls -l /vm-root nad after this : docker run --rm -it -v /:/vm-root alpine:edge ls -l /vm-root/var/lib/docker You are available to lis...
Why does comparing strings using either '==' or 'is' sometimes produce a different result?
...orks interactively is that (most) string literals are interned by default. From Wikipedia:
Interned strings speed up string
comparisons, which are sometimes a
performance bottleneck in applications
(such as compilers and dynamic
programming language runtimes) that
rely heavily on hash ...
Is it not possible to stringify an Error using JSON.stringify?
...
JSON.stringify(err, Object.getOwnPropertyNames(err))
seems to work
[from a comment by /u/ub3rgeek on /r/javascript] and felixfbecker's comment below
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How do I pass a method as a parameter in Python
...do so explicitly. __call__() is meant to be implemented, not to be invoked from your own code.
If you wanted method1 to be called with arguments, then things get a little bit more complicated. method2 has to be written with a bit of information about how to pass arguments to method1, and it needs to...
PHP convert XML to JSON
...
Json & Array from XML in 3 lines:
$xml = simplexml_load_string($xml_string);
$json = json_encode($xml);
$array = json_decode($json,TRUE);
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Why is LINQ JOIN so much faster than linking with WHERE?
...h combination of rows (n1 * n2 * n3 * n4)
The Join operator takes the rows from the first tables, then takes only the rows with a matching key from the second table, then only the rows with a matching key from the third table, and so on. This is much more efficient, because it doesn't need to perfor...
How to convert a scala.List to a java.util.List?
...sts, because the former is immutable and the latter is mutable. So, to get from one to another, you first have to convert the Scala List into a mutable collection.
On Scala 2.7:
import scala.collection.jcl.Conversions.unconvertList
import scala.collection.jcl.ArrayList
unconvertList(new ArrayList ...
Programmatically register a broadcast receiver
... the Broadcast Receiver. The difference of programmatically registering it from registering in AndroidManifest.xml is that. In the manifest file, it doesn't depend on application life time. While when programmatically registering it it does depend on the application life time. This means that if yo...
HTML 5 Favicon - Support?
... website one must use the following code:
Here are detailed instructions from Microsoft but here is a synopsis:
Step 1
Create a square image for your website, to support hi-res screens create it at 768x768 pixels in size.
Step 2
Add a hidden overlay of this image. Here is example code from Mic...
How to get line count of a large file cheaply in Python?
...trategy seems to be the fastest for Windows/Python 2.6
Here is the code:
from __future__ import with_statement
import time
import mmap
import random
from collections import defaultdict
def mapcount(filename):
f = open(filename, "r+")
buf = mmap.mmap(f.fileno(), 0)
lines = 0
readli...