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How can I make a weak protocol reference in 'pure' Swift (without @objc)
weak references don't seem to work in Swift unless a protocol is declared as @objc , which I don't want in a pure Swift app.
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What is the difference between 0.0.0.0, 127.0.0.1 and localhost?
...nd to this address by default. I can still visit it via http://localhost:port . But for Jekyll , it seems that the default setting (e.g. 0.0.0.0:4000) requires Internet access. I cannot run Jekyll server without Internet. Is it a small bug?
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What does Docker add to lxc-tools (the userspace LXC tools)?
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From the Docker FAQ:
Docker is not a replacement for lxc. "lxc" refers to capabilities of the linux kernel (specifically namespaces and control groups) which allow sandboxing processes from one another, and controlling their resource allocations.
On top of this low-level fo...
How to check if object property exists with a variable holding the property name?
I am checking for the existence of an object property with a variable holding the property name in question.
6 Answers
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How to run a command in the background and get no output?
...o shell scripts a.sh and b.sh . In a.sh and b.sh I have a infinite for loop and they print some output to the terminal. I want to write another script which calls both a.sh and b.sh but I want the user to regain control of the terminal immediately, instead of having the script run infinit...
Shards and replicas in Elasticsearch
...an elasticsearch node which tries to join an existing cluster if available or creates a new one. Let's say you created your own new cluster with a single node, the one that you just started up. We have no data, therefore we need to create an index.
When you create an index (an index is automaticall...
Does JSON syntax allow duplicate keys in an object?
...ther standards will refer to this one, strictly adhering to the JSON text format, while
imposing restrictions on various encoding details. Such standards may require specific behaviours. JSON
itself specifies no behaviour.
Further down in the standard (p. 2), the specification for a JSON ob...
Using the “final” modifier whenever applicable in Java [closed]
In Java, there is a practice of declaring every variable (local or class), parameter final if they really are.
25 Answers
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Most underused data visualization [closed]
...really agree with the other posters: Tufte's books are fantastic and well worth reading.
First, I would point you to a very nice tutorial on ggplot2 and ggobi from "Looking at Data" earlier this year. Beyond that I would just highlight one visualization from R, and two graphics packages (which a...
Meaning of Open hashing and Closed hashing
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The use of "closed" vs. "open" reflects whether or not we are locked in to using a certain position or data structure (this is an extremely vague description, but hopefully the rest helps).
For instance, the "open" in "open addressing" tells us the index (aka. address) at...