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What's the scope of a variable initialized in an if statement?
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Python variables are scoped to the innermost function, class, or module in which they're assigned. Control blocks like if and while blocks don't count, so a variable assigned inside an if is still scoped to a function, class, or module.
(Implicit functions defined by a generator expres...
Should I compile release builds with debug info as “full” or “pdb-only”?
In Visual Studio 2010 for a C# project, if you go to Project Properties > Build > Advanced > Debug Info you have three options: none, full, or pdb-only. Based on the answer to this question , I believe I understand some of the differences between full and pdb-only. However, which is more appropri...
Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?
...ike it a lot. But soon I found out that it lacked badly the ability to perform CPU-intensive tasks. So, I started googling and got these answers to solve the problem: Fibers, Webworkers and Threads (thread-a-gogo). Now which one to use is a confusion and one of them definitely needs to be used - aft...
Bootstrap: How do I identify the Bootstrap version?
...witter, Inc
* Licensed under the Apache License v2.0
* http://www.apache.org/licenses/LICENSE-2.0
*
* Designed and built with all the love in the world @twitter by @mdo and @fat.
*/
If they are not there, then they have probably been deleted.
VERSIONS:
You can review version history here. B...
how to log in to mysql and query the database from linux terminal
... get mysql prompt in linux terminal?
mysql -u root -p
At the Enter password: prompt, well, enter root's password :)
You can find further reference by typing mysql --help or at the online manual.
2. How I stop the mysql server from linux terminal?
It depends. Red Hat based distros have the serv...
.c vs .cc vs. .cpp vs .hpp vs .h vs .cxx [duplicate]
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Historically, the first extensions used for C++ were .c and .h, exactly like for C. This caused practical problems, especially the .c which didn't allow build systems to easily differentiate C++ and C files.
Unix, on which C++ ...
JavaScript ternary operator example with functions
...ement of a ternary statement is always evaluated as a Boolean value, therefore you can express:
(IsChecked == true) ? removeItem($this) : addItem($this);
Simply as:
(IsChecked) ? removeItem($this) : addItem($this);
Infact, I would also remove the IsChecked temporary as well which leaves you wi...
Set line spacing
How can I set line spacing with CSS, like we can set it in MS Word?
9 Answers
9
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What does the “|” (single pipe) do in JavaScript?
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This is a bitwise or.
Since bitwise operations only make sense on integers, 0.5 is truncated.
0 | x is x, for any x.
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How to check whether an object is a date?
...ia
typeof date.getMonth === 'function'
you can use the instanceof operator, i.e. But it will return true for invalid dates too, e.g. new Date('random_string') is also instance of Date
date instanceof Date
This will fail if objects are passed across frame boundaries.
A work-around for this is ...