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  2. Lua (programming language) - Wikipedia

    en.wikipedia.org/wiki/Lua_(programming_language)

    For a regular array, with non-nil values from 1 to a given n, its length is exactly that n, the index of its last value. If the array has "holes" (that is, nil values between other non-nil values), then #t can be any of the indices that directly precedes a nil value (that is, it may consider any such nil value as the end of the array). [12]

  3. Module:Lua class - Wikipedia

    en.wikipedia.org/wiki/Module:Lua_class

    Download as PDF; Printable version ... This module provides utilities for declaring classes in Lua code. ... -- custom __index can handle invalid keys if value == nil ...

  4. Help:Lua for beginners - Wikipedia

    en.wikipedia.org/wiki/Help:Lua_for_beginners

    The module itself must return a Lua table of values. A Lua table is expressed as a list of values separated by commas, within curly braces. When the module is called by #invoke, the function it names (the first argument after |) is looked for in that table. That function, in turn, is expected to return something that can be represented as a string.

  5. Nullable type - Wikipedia

    en.wikipedia.org/wiki/Nullable_type

    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 ...

  6. Null (SQL) - Wikipedia

    en.wikipedia.org/wiki/Null_(SQL)

    E. F. Codd mentioned nulls as a method of representing missing data in the relational model in a 1975 paper in the FDT Bulletin of ACM-SIGMOD.Codd's paper that is most commonly cited with the semantics of Null (as adopted in SQL) is his 1979 paper in the ACM Transactions on Database Systems, in which he also introduced his Relational Model/Tasmania, although much of the other proposals from ...

  7. Null coalescing operator - Wikipedia

    en.wikipedia.org/wiki/Null_coalescing_operator

    The null coalescing operator is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, such as (in alphabetical order): C# [1] since version 2.0, [2] Dart [3] since version 1.12.0, [4] PHP since version 7.0.0, [5] Perl since version 5.10 as logical defined-or, [6] PowerShell since 7.0.0, [7] and Swift [8] as nil-coalescing operator.

  8. Wikipedia talk:Lua style guide - Wikipedia

    en.wikipedia.org/wiki/Wikipedia_talk:Lua_style_guide

    I mentioned the 8/4 input because current Lua source that happens to have tabs (because it was prepared somewhere else and was pasted into the edit window) should be using 8-column tabs (an example being Module:Convert/data), while someone writing a new module in the new CodeEditor will get 4-character column tabs if they press the Tab key. A ...

  9. Module:Example of lua debugging - Wikipedia

    en.wikipedia.org/wiki/Module:Example_of_lua...

    Download QR code; Print/export Download as PDF; Printable version; In other projects ... Used as an example in Help:Lua debugging#To see the value of a variable ...