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  • How to understand nil vs. empty vs. blank in Ruby
    I find myself repeatedly looking for a clear definition of the differences of nil?, blank?, and empty? in Ruby on Rails Here's the closest I've come: blank? objects are false, empty, or a whitesp
  • What describes nil best? Whats that really? - Stack Overflow
    As can be seen, they are all exactly the same Nil and nil are defined by Objective-C, NULL comes from C What's the difference then? It's only about style It makes the code more readable
  • xml - What does i:nil=true mean? - Stack Overflow
    16 Maybe i:nil actually means xsi:nil, this means that the FirstName element is empty, i e does not have any content -- not even "" It refers to the nillable property in XML Schema
  • What is the best way to check for a nil value in Lua?
    Statement "~= nil" works also if stats = false You can read in docs: The condition expression of a control structure can return any value Both false and nil are considered false All values different from nil and false are considered true (in particular, the number 0 and the empty string are also true)
  • Difference between nil, NIL, and null in Objective-C
    79 I want to know the difference between nil, NIL, and null I've googled around and found this: nil -> null pointer to Objective-C object NIL -> null pointer to Objective-C class null -> null pointer to primitive type or absence of data But I'm not able to understand the terms "Objective-C object" and "class" clearly Please explain this to me
  • Whats the Difference Between nil and Nil - Stack Overflow
    Nil and nil are defined to be the same thing (__DARWIN_NULL), and are meant to signify nullity (a null pointer, like NULL) Nil is meant for class pointers, and nil is meant for object pointers (you can read more on it in objc h; search for Nil)
  • What is the correct way to represent null XML elements?
    xsi:nil is the correct way to represent a value such that: When the DOM Level 2 call getElementValue () is issued, the NULL value is returned xsi:nil is also used to indicate a valid element with no content even if that elements content type normally doesn't allow empty elements
  • C++ nil vs NULL - Stack Overflow
    Yes It's NULL in C and C++, while it's nil in Objective-C Each language has its own identifier for no object In C the standard library, NULL is a typedef of ((void *)0) In C++ the standard library, NULL is a typedef of 0 or 0L However IMHO, you should never use 0 in place of NULL, as it helps the readability of the code, just like having constant variables in your code: without using NULL
  • (nil) pointer in C C++ - Stack Overflow
    This is going to distinguish a null-pointer and print (nil) because it is a special value in the context of a pointer If you want to output 0 for a null pointer, cast the pointer to an integer and use %d instead:





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