Difference between nil, NULL and Nil in iOS (2024)

FAQs

Difference between nil, NULL and Nil in iOS? ›

nul and null are two different things. null is a pointer to address 0, while nul is the name of the character with value 0. That distinction is sometimes elided (people often say "null-terminated" rather than "nul-terminated"), but that's the distinction the API names are based on.

nul and null are two different things. null is a pointer to address 0, while nul is the name of the character with value 0. That distinction is sometimes elided (people often say "null-terminated" rather than "nul-terminated"), but that's the distinction the API names are based on.

The term nil sometimes refers to what's called the unit type - an empty tuple. None is one of values of the Option enum from the standard library, which is Rust's safe idiom for nullable types.…

Let's start out with “Nil” since it's the most common and easy-to-understand way of representing nothingness in Ruby. In terms of what it means, Nil is exactly the same thing as null in other languages. So, what is null? Null, as it exists in many languages, is a sort of value that represents “nothing”.

Programming languages use different literals for the null pointer. In Python, for example, a null value is called None . In Pascal and Swift, a null pointer is called nil .

Nil is for object pointers, NULL is for non pointers, Null and Nil both defined to be equal to the value zero. NULL is a void *, nil is an id, and Nil is a Class pointer, NULL is used for non-object pointer (like a C pointer) in Objective-C. Like nil , NULL got no value nor address (used to check if a struct is empty).

: not any : no.

In the simplest of terms, Name, Image and Likeness (NIL) is a term that describes the means through which college athletes are allowed to receive financial compensation. NIL refers to the use of an athlete's name, image, and likeness through marketing and promotional endeavors.

Python uses the keyword None to define null objects and variables. While None does serve some of the same purposes as null in other languages, it's another beast entirely. As the null in Python, None is not defined to be 0 or any other value. In Python, None is an object and a first-class citizen!

In general use, nil (a contraction of Latin "nihil") means "nothing" or the absence of something. Sometimes nil is used to mean the number zero (0). In programming, nil refers to an empty set or a list containing no entries.

Why does go use nil instead of null? ›

nil is an identifier for the zero value in many of the language's types. It's reminiscent of null in other languages, but it would be a mistake to treat them the same way. nil is not null . In fact, sometimes nil isn't even nil .

In mathematics, the word null (from German: null meaning "zero", which is from Latin: nullus meaning "none") is often associated with the concept of zero or the concept of nothing. It is used in varying context from "having zero members in a set" (e.g., null set) to "having a value of zero" (e.g., null vector).

NOT NULL means a column to NOT accept NULL values. Null in other way means zero or empty value. Thus, Null means you can leave that field empty. And Not Null means you can't leave the value of that field empty.

An explanation of nil

In Emacs Lisp, the symbol nil has two meanings. First, it means the empty list. Second, it means false and is the value returned when a true-or-false-test tests false. nil can be written as an empty list, () , or as nil .

Strictly speaking python's "None" is basically equivalent to "null" in Java is equivalent to "undefined"/"null" in JS. That one is equivalent to nim's "nil". That type you will only get if you deal with ref-types, aka when you declare your type like so: type A = ref object ...

Swift uses nil because Objective-C uses nil. Objective-C uses nil because Smalltalk uses nil. And Smalltalk uses nil because most languages that don't descend from C use nil, all the way back to Lisp.

It is often abbreviated as NUL (or NULL, though in some contexts that term is used for the null pointer). In 8-bit codes, it is known as a null byte. The original meaning of this character was like NOP—when sent to a printer or a terminal, it has no effect (some terminals, however, incorrectly display it as space).

It's important to note, that NULL doesn't equal NULL. NULL is not a value, and therefore cannot be compared to another value. where x is null checks whether x is a null value.

A: Although they may seem similar and are sometimes used interchangeably, it's generally better to use them for their intended purposes. Use null when you want to represent the intentional absence of a value, and undefined when a variable has not been assigned a value.

The IS NULL condition is satisfied if the column contains a null value or if the expression cannot be evaluated because it contains one or more null values. If you use the IS NOT NULL operator, the condition is satisfied when the operand is column value that is not null, or an expression that does not evaluate to null.