Lua table库

t = {}
table.insert( t , 1 , 1 )
print("#t",#t)
table.remove( t , 1 )
print("#t",#t)


lines = {
luaH_set = 10 ,
luaH_het = 24 ,
luaH_present = 48
}

a = {}
for n in pairs( lines ) do
a[#a+1] = n
end
table.sort(a)
for i,n in ipairs(a) do
print(" a : " , n)
end

function pairsByKeys( t , f )
local a = {}
for n in pairs(t) do a[#a+1] = n end
table.sort( a , f )
local i = 0  -- 迭代器变量
return function()  -- 迭代器函数
    i = i + 1
    return a[i],t[a[i]]
end
end

for name, line in pairsByKeys(lines) do
print( "pairsByKeys : ", name , line)
end


function rconcat( l )
if type(l) ~= "table" then
    return l
end
local res = {}
for i = 1 , #l do
    res[i] = rconcat( l[i] )
end
return table.concat(res)
end

print("concat(lines) : " , rconcat( {{" a ",{" nice "}}, {{" long "},{" list "}}} )