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what is the difference between ?:, ?! and ?= in regex?
..."ab".
The difference between ?: and ?= is that ?= excludes the expression from the entire match while ?: just doesn't create a capturing group. So for example a(?:b) will match the "ab" in "abc", while a(?=b) will only match the "a" in "abc". a(b) would match the "ab" in "abc" and create a capture ...
How to create a new branch from a tag?
I'd like to create a new master branch from an existing tag. Say I have a tag v1.0 . How to create a new branch from this tag?
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How do you implement a Stack and a Queue in JavaScript?
....shift(); // queue is now [5]
alert(i); // displays 2
taken from "9 javascript tips you may not know"
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How can I run a function from a script in command line?
...of executing the script, so take care.
There is no way to call a function from a shell script as if it were a shared library.
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How can you set class attributes from variable arguments (kwargs) in python
... self.B = True
# get a list of all predefined values directly from __dict__
allowed_keys = list(self.__dict__.keys())
# Update __dict__ but only for keys that have been predefined
# (silently ignore others)
self.__dict__.update((key, value) for key, val...
Can IntelliJ IDEA encapsulate all of the functionality of WebStorm and PHPStorm through plugins? [cl
...found within IntelliJ IDEA (you need to install the corresponding plug-ins from the repository).
It includes support for all technologies developed for our more specific products such as Web/PhpStorm, RubyMine and PyCharm.
The specific feature missing from IntelliJ IDEA is simplified project creatio...
When should an IllegalArgumentException be thrown?
...icate that a method has been passed an illegal or inappropriate argument.
From looking at how it is used in the JDK libraries, I would say:
It seems like a defensive measure to complain about obviously bad input before the input can get into the works and cause something to fail halfway through wi...
How to stop /#/ in browser with react-router?
Any way to prevent /#/ from showing in the browser's address bar when using react-router? That's with ReactJS. i.e. Clicking on links to go to a new route shows localhost:3000/#/ or
localhost:3000/#/about . Depending on the route.
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What does the “yield” keyword do?
... generator object, this is a bit tricky :-)
Then, your code will continue from where it left off each time for uses the generator.
Now the hard part:
The first time the for calls the generator object created from your function, it will run the code in your function from the beginning until it hit...
Shorter syntax for casting from a List to a List?
I know its possible to cast a list of items from one type to another (given that your object has a public static explicit operator method to do the casting) one at a time as follows:
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