The calling function may simply iterate the list as normal, effectively doing nothing Nullable types are a feature of some programming languages which allow a value to be set to the special value null instead of the usual possible values of the data type It is, however, still possible to check whether the return value is a null object (an empty list) and react differently if desired.
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In other cases a null value is returned if there is no explicit return statement
In python, the value none is returned when the return statement is omitted, [4] while in javascript the value undefined is returned.
It is used in generics for denoting return types of void In go, the unit type is written struct{} and its value is struct{}{} In php, the unit type is called null, which only value is null itself Otherwise it performs a dereferencing operation as specified by the second argument (typically an object member access, array index, or lambda.
For example, the following will return the default title if either the page object is null or page is not null but its title property is: Null pointer in computing, a null pointer (sometimes shortened to nullptr or null) or null reference is a value saved for indicating that the pointer or reference does not refer to a valid object. Otherwise, return the value of r
