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What is the difference between typeof and instanceof and when should one be used vs. the other?
...} instanceof Object; // true
typeof {}; // object
And the last one is a little bit tricky:
typeof null; // object
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What happens to a declared, uninitialized variable in C? Does it have a value?
If in C I write:
10 Answers
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Why should I use the keyword “final” on a method parameter in Java?
I can't understand where the final keyword is really handy when it is used on method parameters.
12 Answers
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what is the difference between XSD and WSDL
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XSD defines a schema which is a definition of how an XML document can be structured. You can use it to check that a given XML document is valid and follows the rules you've laid out in the schema.
WSDL is a XML document that describes a web service. It shows w...
When to use Mockito.verify()?
I write jUnit test cases for 3 purposes:
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What is null in Java?
...pression is not null and the reference could be cast to the ReferenceType without raising a ClassCastException. Otherwise the result is false.
This means that for any type E and R, for any E o, where o == null, o instanceof R is always false.
What set does 'null' belong to?
JLS 4.1 The Kin...
Class does not implement its superclass's required members
...want to be NSCoding-compatible is to do something like this:"
required init(coder: NSCoder) {
fatalError("NSCoding not supported")
}
If you know you don't want to be NSCoding compliant, this is an option. I've taken this approach with a lot of my SpriteKit code, as I know I won't be loading it...
Runtime vs. Compile time
...is an example of what pointy-headed theorists call the phase distinction. It is one of the hardest concepts to learn, especially for people without much background in programming languages. To approach this problem, I find it helpful to ask
What invariants does the program satisfy?
What can go w...
Why is SCTP not much used/known
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Indeed, SCTP is used mostly in the telecom area. Traditionally, telecom switches use SS7 (Signaling System No. 7) to interconnect different entities in the telecom network. For example - the telecom provider's subscriber data base(HLR), with a switch (MSC), the subscriber is co...
Is it alright to use target=“_blank” in HTML5?
I recall reading somewhere that in HTML5 it was no longer okay to use target="_blank" in HTML5, but I can't find it now.
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