Difference between revisions of "Lua: Vararg"
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| − | A '''vararg''' statement is basically a group of arguments with a variable size. Usually, a function is defined to use only a certain number of parameters, but a vararg statement allows it to take an arbitrary amount. In [[Lua]], a vararg statement is defined with three dots (...). This vararg statement represents a table passed to the function, containing the arguments that were provided. A function can only contain one vararg statement, which should be the last parameter. | + | A '''vararg''' statement is basically a group of arguments with a variable size. Usually, a function is defined to use only a certain number of parameters, but a vararg statement allows it to take an arbitrary amount. In [[Lua]], a vararg statement is defined with three dots (...). This vararg statement represents a list of values (''not'' a table in itself!) passed to the function, containing the arguments that were provided. A function can only contain one vararg statement, which should be the last parameter. |
The following function takes any number of values, chooses one at random, and returns it: | The following function takes any number of values, chooses one at random, and returns it: | ||
| − | <source lang="lua">function choose(...) | + | <source lang="lua" enclose="div">function choose(...) |
| − | local args = {...} | + | local args = {...} |
return args[math.random(#args)] | return args[math.random(#args)] | ||
end</source> | end</source> | ||
Vararg statements can even be used along with explicit parameters, like: ''function test(abc, xyz, ...)''. | Vararg statements can even be used along with explicit parameters, like: ''function test(abc, xyz, ...)''. | ||
Revision as of 21:55, 16 July 2009
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A vararg statement is basically a group of arguments with a variable size. Usually, a function is defined to use only a certain number of parameters, but a vararg statement allows it to take an arbitrary amount. In Lua, a vararg statement is defined with three dots (...). This vararg statement represents a list of values (not a table in itself!) passed to the function, containing the arguments that were provided. A function can only contain one vararg statement, which should be the last parameter.
The following function takes any number of values, chooses one at random, and returns it:
function choose(...)
local args = {...}
return args[math.random(#args)]
endVararg statements can even be used along with explicit parameters, like: function test(abc, xyz, ...).
