lua_check_eins_zwei.lua

-- this 
-- is
-- a
-- single
-- line
-- comment
 
--[[
	this
	is
	a
	multiline
	comment
]]
print("hello lua")
 
 
 
 
print("====================")
--[[
	[variable type]
	- num
	- string
	- boolean (!!!: false, nilだけが偽、それ以外はすべて真。 0もtrueになる)
	- nil
	- table
	- function
	
	note:
	- 型は動的に決まる
]]
our_valiable = "yo"
print(our_valiable)
 
-- !!!: イケてる 多重代入可能
x, y, z = 10, 20, 30
print(x)
print(y)
print(z)
 
x, y = y, x -- swap
print(x)
print(y)
 
 
 
print("====================")
--[[
	strings
]] 
s = "our string"
print(s)
 
s = "this is a\ttab"
print(s)
 
s = [[this is a\ttab]]
print(s)
 
s = "hello " .. "lua" -- !!!:結合は ..
print(s)
 
s = "hello " .. 123 -- !!!:結合は ..
print(s)
 
print("---")
 
s = "hello i am a sample text"
print( "len:" .. string.len(s) )
print( "#:" .. #s )
print( "find 'a':" .. string.find(s, "i") )
print( "sub '0, 5':" .. string.sub(s, 0, 5) )
print( "gsub 'hello, hi':" .. string.gsub(s, "hello", "hi") )
 
 
 
 
print("====================")
--[[
	table (hash)
]]
a = {23, 456, "hi"}
print(a[0]) -- !!!: nil luaの配列は 1 origin
print(a[1]) -- 23
print(a[2]) -- 456
print(a[3]) -- hi
 
user = { name = "motoi", score = 10000 }
print(user["name"])
print(user.score)
 
 
 
print("====================")
--[[
	control structure::if
]]
if user.score > 1000 then
	print("dragon!")
elseif user.score > 500 then
	print("yolo!")
else
	print("sigh.....")
end
 
 
-- 関係演算子
if user.name == "motoi" then
	print("username is motoi")
end
 
if user.name ~= "shimizu" then
	print("not equalは != じゃなくて ~= なので注意")
end
 
-- 論理演算子 !!!: and not or 
 
our_num = 50
our_bool = true
 
if our_num > 30 and our_num < 60 then
	if our_bool and true then
		print("and not or")
	end
end
 
 
 
 
print("====================")
--[[
	control structure::loop
	
	for
	while
	repeat...until (初回は必ず実行される)
	
]]
i = 0
for i = 0, 9 do -- 0~9
	print(i)
end
print("---")
 
 
i = 0
for i = 0, 9, 2 do -- !!!: 0~9, 2ずつincする
	print(i)
end
print("---")
 
 
pnd = {"poems", "not", "demos"}
for i, value in ipairs(pnd) do
	print(i, value)
end
print("---")
 
 
p = {oldschool = "fatboy slim", newschool = "run dmc"}
for key, value in pairs(p) do
	print(key, value)
end
print("---")
 
 
i = 0
while i < 10 do
	print(i)
	i = i + 1 -- i += 1 はダメ
end
print("---")
 
 
i = 0
repeat
	print(i)
	i = i + 1 -- i += 1 はダメ
until i >= 10
print("---")
 
 
 
 
 
print("====================")
--[[
	function
]]
function greet(name)
	return "Greetings, " .. name
end
 
print( greet("Norman Cook") )
 
 
function sum(...) -- !!!: 引数何個でも
	local numbers = {...}
	local total = 0
	for i = 1, #numbers do
		total = total + numbers[i]
	end
	
	return total
end
 
print( "sum(1,2,3,4,5,6,7,8,9,10): " .. sum(1,2,3,4,5,6,7,8,9,10) )
 
 
 
 
print("====================")
--[[
	date
]]
 
print( os.date() )
print( os.date("%Y-%m-%d") )
print("---")
date = os.date("*t")
for key, value in pairs(date) do
	print(key, value)
end