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With ^ right after [they indicate "anything but": [^abc] = not a, b, or c. Inside brackets and when not the first character, a minus -indicates a range: [a-z] matches one single character from a, b, c, …, z. Period . matches any character. Percent % indicates a large set (class) of possible character matches when it is followed by a letter.
It also returns nil values as nil, to allow for distinctions between nil and false. The module also accepts other Lua structures as input, i.e. booleans, numbers, tables, and functions. If it is passed input that it does not recognise as boolean or nil, it is possible to specify a default value to return.
This can be any Lua value. This parameter is optional, and defaults to nil. options: A table of options. This parameter is optional. The following options can be specified in the options table: pretty: If true, output the string in "pretty" format (as in pretty-printing). This will add new lines and indentation between table items.
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:
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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.
The number 0, the strings "0" and "", the empty list (), and the special value undef evaluate to false. [8] All else evaluates to true. Lua has a Boolean data type, but non-Boolean values can also behave as Booleans. The non-value nil evaluates to false, whereas every other data type
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...