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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...bar. However, if you have a lot of quotes in your string these alternative forms can get hard to read (and therefore hard to maintain). This page provides a good introduction to quoting in Bash.
Arrays ($var vs. $var[@] vs. ${var[@]})
Now for your array. According to the bash manual:
Referenci...
Explaining Python's '__enter__' and '__exit__'
...ock, addrs):
>>> logging.basicConfig(level=logging.DEBUG, format='%(asctime)s \
>>> : %(levelname)s --> %(message)s')
>>> logging.info('Initiating My connection')
>>> self.sock = sock
>>> self.addrs = addrs
>&...
MySQL ON vs USING?
... +1 Nice answer on the syntactical difference. I'm curious about performance differences, if any. I imagine USING interprets to ON.
– Jason McCreary
Jul 6 '12 at 17:36
...
Difference between DTO, VO, POJO, JavaBeans?
... Practically, they are classes written in the Java programming language conforming to a particular convention. They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects. A JavaBean is...
How does `is_base_of` work?
...ce because whether we can convert from a D* to a B* isn't dependent on the form of inheritance according to 4.10/3
If they are not related
Now let's assume they are not related by inheritance. Thus for the first function we have the following candidates
D* (Host<B, D>&)
And for the s...
What exactly does Perl's “bless” do?
...e is no subroutine foo in package "Class", a list of other packages (taken form the array @ISA in the package "Class") will be searched and the first subroutine foo found will be called.
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imp...
What is the difference between concurrency and parallelism?
...t exists when at least two threads are making progress. A more generalized form of parallelism that can include time-slicing as a form of virtual parallelism.
Parallelism: A condition that arises when at least two threads are executing simultaneously.
...
How do I set a cookie on HttpClient's HttpRequestMessage
... api's HttpClient to do a post to an endpoint that requires login in the form of an HTTP cookie that identifies an account (this is only something that is #ifdef 'ed out of the release version).
...
REST API Best practice: How to accept list of parameter values as input [closed]
...mmunity input on best practices around how we should have input parameters formatted:
6 Answers
...
All falsey values in JavaScript
...ues in JavaScript
false
Zero of Number type: 0 and also -0, 0.0, and hex form 0x0 (thanks RBT)
Zero of BigInt type: 0n and -0n (new in 2020, thanks GetMeARemoteJob)
"", '' and `` - strings of length 0
null
undefined
NaN
document.all (in HTML browsers only)
This is a weird one. document.all is a...