lua study notes

execute.txt

# execute a program
$ lua hello.lua

# import a file and then into interactive mode
$ lua -i lib.lua

# execute some line
$ lua -e "print(math.sin(12))"

# execute with library "a" (using "-l")
$ lua -i -l a -e "x = 10"

# execute with parameters ("p1 p2 p3")
$ lua script.lua p1 p2 p3

functions.lua

--[[ now this is a comment ]]--

--[[
function useless_func()

end
]]--

function norm(x, y)
    return (x^2+y^2)^0.5
end

function twice(x)
    return 2*x
end

hello.lua

print("Hello, world!")

lua-study.md

This gist is some study notes for Lua language.

variables.lua

--[[ a uninitialized global variable ]]--
print('this would be nil: b = ', b)

b = 10
print('this would be 10: b = ', b)

--[[ an environment variable (using "lua>" as a prompt ]]--
_PROMPT = "lua>"