lua tutorial sandbox

main.lua

#!/usr/bin/lua

-- LUA
--

-- Tutorial https://www.tutorialspoint.com/lua/lua_standard_libraries.htm
-- Resources https://github.com/LewisJEllis/awesome-lua - resources
-- Packages https://luarocks.org/

print("hello world")

-- this is a comment
mad = "mad"
mad = string.upper(mad)
print("It's a very very... \a"..mad..[[ world ]])--[[inline comment .. concats two strings --]] --"comment"

print(type("What is my type"))   --> string
t = 10

arr = {
5.8*t,               --> number
true,                --> boolean
print,               --> function
nil,                 --> nil
type(ABC),           --> string
}

function typePrinter(variable_for_printing)
    print(type(variable_for_printing))
end

for key, value in ipairs(arr) do
    typePrinter(value)
end

lua = "Lua"
print(string.byte(lua))
print(string.len(lua))

-- Tables

local myTable = {}

myTable[1] = "LuaTable"

myTable[2] = function(arg)
    print(arg)
end

myTable[2](myTable[1])

myTable = nil

if myTable then
    myTable[2](myTable[1])
else 
    print("guess not")
end

-- Modules and metatables
mod = require("mymod")

print("mymodule")
mod.myModuleFunction()

setmetatable(mod,{keyZ="metatable value"})

print(getmetatable(mod)["keyZ"])


-- coroutines
c = coroutine.create(function (seconds,max)
    
    assert(seconds > 0, "you gotta wait for longer than 0 seconds- sorry")
    for i = 1, max do
        mod.fnwithwait(seconds)
        print("coroutine: "..tostring(coroutine.running()).." waited for "..seconds..", will run another "..max-i.." times")
        coroutine.yield()
    end

    print("end")
    return 5

end)

time = 1
max = 1

for i = 0, max do
    coroutine.resume(c,time,max)
    print(r,c,"isrunning: "..tostring(coroutine.running()))
    print("status: "..coroutine.status(c))
    --assert(!(coroutine.status == dead) && i < max,"coroutine did not complete")
end

-- Files

f = io.open("test.json", "r")
io.input(f)
all = f:read("*a")
io.close(f)

--cjson //from luarocks

local cjson = require("cjson")

obj = cjson.decode(all)

print(obj,"value: "..obj["hello"])