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local p = {}-- Defines a variable p as an empty table, but *not* nil. function p. main (frame)-- This block defines the table element p["main"] as a function. return "Hello world"-- The string result of the function. end-- Ends the block defining the function object p["main"] (or p.main). return p-- This returns the table p, which under the key ...
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior.The null object design pattern, which describes the uses of such objects and their behavior (or lack thereof), was first published as "Void Value" [1] and later in the Pattern Languages of Program Design book series as "Null Object".
In Lisp, nil is a first class object. By convention, (first nil) is nil, as is (rest nil). So dereferencing nil in these contexts will not cause an error, but poorly written code can get into an infinite loop. In .NET and C#, access to null reference (null) causes a NullReferenceException to be thrown. Although catching these is generally ...
This module is subject to page protection.It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.
xsi:nil is not allowed in binary context. 1–2 bit integer interpreted as boolean. Boolean sign, plus arbitrary length 7-bit octets, parsed until most-significant bit is 0, in little-endian.
All methods have an unnamed parameter containing the text. The return value is an empty string if the parameter does not meet the conditions. When the condition is matched or some result is successfully found, strings of at least one character are returned.
(In other words, any of the items before the final item is nil, e.g. {'foo', 'bar', nil, 'baz'}.) If you try and use this module on a sparse array, you might get an erroneous value. If you try and use this module on a sparse array, you might get an erroneous value.
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.In statically typed languages, a nullable type is an option type, [citation needed] while in dynamically typed languages (where values have types, but variables do not), equivalent behavior is provided by having a single null ...