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Almost everything is a table. If it isn't a table, it's a string, a number, a boolean, a function, or a nil. Libraries are tables. string.gmatch is the "gmatch" entry in the table named by the global variable string. Arguments that you receive from MediaWiki are tables. But they're a bit special. Arrays are tables that follow a specific convention.
A table is a sequence, optionally supplemented by named keys: digit["two"]="2". Several table functions like table.concat will only work with the numbered values and ignore named keys. The metatable offers a large, optional set of methods for altering table behavior. For example, you can define a table to be callable like a function.
An entry at Convert is defined as a multi-line, multi-attribute Lua table with its attendant syntax, and inside a larger Lua script. Therefore Convert is more conservative about adding units. Val may be more liberal in this respect if only because unit entry is simpler and "wikified". Therefore WP:Be bold. Bold customization may be a worthwhile ...
[3] math.floor is a table lookup (of the string "floor") in the (global) math table, for example. Table lookups are slower, at runtime, than local variable lookups. Table lookups in tables such as the args table with its "specialness" are a lot slower. A function in Lua can have up to 250 local variables. [4] So make liberal use of them:
a_table = {x = 10}-- Creates a new table, with one entry mapping "x" to the number 10. print ... Lua tables are optimized for use as arrays to help avoid this issue.
This module includes a number of set operations for Lua tables. It currently has union, intersection and complement functions for both key/value pairs and for values only. . It is a meta-module, meant to be called from other Lua modules, and should not be called directly from #invo
An entry at Convert is defined as a multi-line, multi-attribute Lua table with its attendant syntax, and inside a larger Lua script. Therefore Convert is more conservative about adding units. Val may be more liberal in this respect if only because unit entry is simpler and "wikified". Therefore WP:Be bold. Bold customization may be a worthwhile ...
The number of entries to transclude, such as count=5; the default is 10. User:JL-Bot/Project content provides a useful way to maintain the data page in a format suitable for Transclude DYK. See also