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See also: the {{}} template. The #if function selects one of two alternatives based on the truth value of a test string. {{#if: test string | value if true | value if false}} As explained above, a string is considered true if it contains at least one non-whitespace character.
While this page doesn't currently have anything to say about semicolons, in Lua code they're generally avoided except when necessary (i.e. a statement ending with a function call is followed by a statement starting with a parenthesized expression) or when multiple statements are on a line.
Some important things like mw.ustring.gmatch actually return functions, not strings - see Functions below. no such module. You #invoked a module that didn't exist — or wrote #invoke:Module:x instead of #invoke:x. the function specified did not exist. You #invoked a module, but the field after the name of the module is wrong. Often this field ...
Not equal, "!=". It probably is a good habit to always use the numbered parameters, since you might not know beforehand exactly how the data will look that your template will feed to this meta-template.
Scribunto Lua reference manual (Manual for the Mediawiki implementation) Programming in Lua (Official book/introduction to Lua) Lua tutorials at lua-users.org; Wiktionary:Lua on English Wiktionary: contains notes on efficiency and on dealing with Unicode and UTF-8
Marshalling data between C and Lua functions is also done using the stack. To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
"Moderate coffee drinking has been related to health benefits," lead study author Lu Qi, M.D., PhD, interim chair of the Department of Epidemiology at Tulane University, told Fox News Digital.
In the above example, IIf is a ternary function, but not a ternary operator. As a function, the values of all three portions are evaluated before the function call occurs. This imposed limitations, and in Visual Basic .Net 9.0, released with Visual Studio 2008, an actual conditional operator was introduced, using the If keyword instead of IIf ...