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What's the difference between deadlock and livelock?
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Taken from http://en.wikipedia.org/wiki/Deadlock:
In concurrent computing, a deadlock is a state in which each member of a group of actions, is waiting for some other member to release a lock
A livelock is similar to a deadlock,
e...
Parsing a CSV file using NodeJS
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@ShashankVivek - in this old answer (from 2015), 'async' is an npm library that is used. More about it here caolan.github.io/async - to understand why maybe this helps blog.risingstack.com/node-hero-async-programming-in-node-js But javascript has evolved a lot ...
What does 'require: false' in Gemfile mean?
...:require => false these particular gems and explicitly require "thegem" from the rake task. This would then save memory in the main app processes and startup time etc. App performance, however, should not be affected even if you require these additional gems in every process.
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Finding all possible permutations of a given string in python
I have a string. I want to generate all permutations from that string, by changing the order of characters in it. For example, say:
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Stack, Static, and Heap in C++
...ide the scope of this answer, but suffice to say you always add and remove from the end only. Stacks usually start high and grow down to lower addresses. You run out of memory when the stack meets the dynamic allocator somewhere in the middle (but refer to physical versus virtual memory and fragment...
What is the exact difference between currentTarget property and target property in javascript
...present. It's the most recent target that caught the event that bubbled up from elsewhere.
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SQL keys, MUL vs PRI vs UNI
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DESCRIBE <table>;
This is acutally a shortcut for:
SHOW COLUMNS FROM <table>;
In any case, there are three possible values for the "Key" attribute:
PRI
UNI
MUL
The meaning of PRI and UNI are quite clear:
PRI => primary key
UNI => unique key
The third possibility, MUL...
What is “Linting”?
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Cite from wikipedia - “The term was derived from the name of the undesirable bits of fiber and fluff found in sheep's wool.”
– tan9
Jul 21 '16 at 5:39
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Is there any way to ignore INSTALL_FAILED_VERSION_DOWNGRADE on application install with the Android
...nd use adb uninstall -k <package> and then installing the older apk.
From the adb usage guide:
adb uninstall [-k] <package> - remove this app package from the device
('-k' means keep the data and cache directories)
I've tried it myself with my apk, ...
Meaning of $? (dollar question mark) in shell scripts
...returns a status of 1:
true
echo $? # echoes 0
false
echo $? # echoes 1
From the manual: (acessible by calling man bash in your shell)
$? Expands to the exit status of the most recently executed foreground pipeline.
By convention an exit status of 0 means success, and non...