What is difference between nil and NULL in Objective-C?

The difference is that while NULL represents zero for any pointer, nil is specific to objects (e.g., id) and Nil is specific to class pointers.

Is nil same as NULL in C?

They’re technically the same thing (0), but nil is usually used for an Objective-C object type, while NULL is used for c-style pointers (void *).

IS NULL same as nil?

NULL and nil are equal to each other, but nil is an object value while NULL is a generic pointer value ((void*)0, to be specific). [NSNull null] is an object that’s meant to stand in for nil in situations where nil isn’t allowed. For example, you can’t have a nil value in an NSArray.

What is nullable in Objective-C?

In Objective-C, you work with references to objects by using pointers that can be null, called nil in Objective-C. In Swift, all values — including object instances — are guaranteed to be non-null. Instead, you represent a value that could be missing as wrapped in an optional type.

What is the difference between nil and none in Swift?

Answer : There is no difference. Optional. None (. None for short) is the correct way of initializing an optional variable lacking a value, whereas nil is just syntactic sugar for .

Is nil the same as NULL Ruby?

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. Null, as it exists in many languages, is a sort of value that represents “nothing”. …

Why is it nil instead of zero?

Another name for 0 that is used in sports is “nil”. This is derived from the Latin word “nihil”, which means “nothing”. Although common in British English, in football results and the like, it is only used infrequently in U.S. English.

What is the difference between none and nil?

There is no difference, as . none (basically it’s Optional. none ) and nil are equivalent to each other. The use of nil is more common and is the recommended convention.

What is difference between NULL and nothing?

Nothing is sometimes confused with Null, but they are very different concepts because Nothing means absence of anything, while Null means unknown (you do not know if there is a thing or not). See, null is usually used to define the invalidity of an instance. Basically it means ‘nothing’.

Which is correct Nill or NULL?

As nouns the difference between null and nill is that null is zero, nil; the cardinal number before einn while nill is shining sparks thrown off from melted brass.

What is null in Swift?

In Swift, nil means the absence of a value. Sending a message to nil results in a fatal error. An optional encapsulates this concept. An optional either has a value or it doesn’t.

How kotlin is null safe?

Kotlin has a safe call operator (?.) to handle null references. This operator executes any action only when the reference has a non-null value. Otherwise, it returns a null value. The safe call operator combines a null check along with a method call in a single expression.