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“Variable” variables in Javascript?
...les that do not become a property of window are variables defined with let and const, and classes.
There is almost always a better solution than using variable variables! Instead you should be looking at data structures and choose the right one for your problem.
If you have a fixed set of names, s...
How to embed an autoplaying YouTube video in an iframe?
I am trying to embed the new iframe version of a YouTube video and get it to auto play.
14 Answers
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Ruby: kind_of? vs. instance_of? vs. is_a?
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kind_of? and is_a? are synonymous.
instance_of? is different from the other two in that it only returns true if the object is an instance of that exact class, not a subclass.
Example:
"hello".is_a? Object and "hello".kind_of? Obje...
Clearing coverage highlighting in Eclipse
...ura or an EMMA plugin), my source code files get highlighted in green, red and yellow depending on which lines of code were covered by tests.
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How does Junit @Rule work?
...n a more generic way.
For instance, ExternalResource executes code before and after a test method, without having to use @Before and @After. Using an ExternalResource rather than @Before and @After gives opportunities for better code reuse; the same rule can be used from two different test classes....
When should I use a struct instead of a class?
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MSDN has the answer:
Choosing Between Classes and Structures.
Basically, that page gives you a 4-item checklist and says to use a class unless your type meets all of the criteria.
Do not define a structure unless the
type has all of the following
characterist...
Match everything except for specified strings
...en or blue anywhere in it. For that, anchor the regular expression with ^ and include .* in the negative lookahead:
^(?!.*(red|green|blue))
Also, suppose that you want lines containing the word "engine" but without any of those colors:
^(?!.*(red|green|blue)).*engine
You might think you can f...
Bootstrap: align input with button
Why don't buttons and inputs align well in Bootstrap?
12 Answers
12
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Thread vs ThreadPool
What is the difference between using a new thread and using a thread from the thread pool? What performance benefits are there and why should I consider using a thread from the pool rather than one I've explicitly created? I'm thinking specifically of .NET here, but general examples are fine.
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Concatenating string and integer in python
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Modern string formatting:
"{} and {}".format("string", 1)
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