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ValueMatcher. notNil = createMatcher (function (value) if value == nil then return false, 'was nil.' else return true end end)--- Matches a specific value type. ValueMatcher . matchType = function ( typeName ) return createMatcher ( function ( value ) if type ( value ) == typeName then return true else return false , ( 'was not a %s, but a %s ...
Only false and nil are false. Even "" is true. Tables can have both numeric and string entries. The two don't overlap. t [1] is distinct from t ["1"]. Uninitialized variables and nonexistent fields in tables are nil. or and and both have shortcut evaluation. = is assignment, == is equality comparison. not is boolean negation, but ~= is ...
It creates a local variable named p on line 1, initialized to a table; builds and adds a function to it (lines 3–5), by giving the function the name India in the table named by p (function p. India being the same as saying p [ "India" ] = function [ d ] ); and then returns (on line 7) the table as the last line of the script.
Lua patterns deliberately lack the most complex regular expression constructs (to avoid bloating the Lua code base), where many other computer languages or libraries use a more complete set. Lua patterns are not even a subset of regular expressions, as there are also discrepancies, like Lua using the escape character % instead of \, , and ...
While Lua allows the true and false boolean values, wikicode templates can only express boolean values through strings such as "yes", "no", etc. This module processes these kinds of strings and turns them into boolean input for Lua to process. It also returns nil values as nil, to allow for distinctions between nil and false. The module also ...
-- This module is intended to replace the functionality of Template:Formatnum and related templates. local p = {} function p. main (frame) local args = frame: getParent (). args local prec = args. prec or '' local sep = args. sep or '' local number = args [1] or args. number or '' local lang = args [2] or args. lang or ''-- validate the language parameter within MediaWiki's caller frame if ...
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Contains a functions to help debug the lua modules.It allows to collect and view the values of several variables and/or points in your lua program, from a module (which is usual) or in several modules (which are required from the main module).