Functions

Normal

function name (arg)
    -- function body
    return 1 + 2 -- returining values is optional
end

name = function (param) print (param) end

Functions can return multiple values.

function name (arg)
    return 1, 2, 3, 4
end

The following are the same functions.

function log(x)
    print(x)
end

log = function(x) print(x) end

Higher order Functions

Taking Function as Argument

function name (para)
    para("hi")
end

name(print)

Returning Functions

function name () 
    return function (value) print (value) end
end

name()("hi")

Working with Tables

function name (table)
    print(table.key)
end

name({key = 69}) -- valid
name{key = 69}   -- valid