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Named Arguments

Instead of positional arguments, you can use the names of arguments you want to set:

pluto
local function process_file(file, mode = "r", version = 1)
    print($"Processing {file} with mode '{mode}' and version {version}")
end
process_file(file = "hello.txt", version = 2) -- "Processing hello.txt with mode 'r' and version 2"

Note that this example also makes use of default arguments and string interpolation.

Mixing arguments​

You can use positional arguments for the first few arguments and then use named arguments for the latter ones, for example:

pluto
local function process_file(file, mode = "r", version = 1)
    print($"Processing {file} with mode '{mode}' and version {version}")
end
process_file("hello.txt", version = 2) -- "Processing hello.txt with mode 'r' and version 2"

Limitations​

This feature is implemented entirely in the parser and therefore only works for local functions at the moment.