Lua打印菱形：居中对称的层次拼装

local function topPyramid(n)
    local out = {}
    for i = 1, n do
        out[#out + 1] = string.rep(" ", n - i)
            .. string.rep("*", 2 * i - 1)
    end
    return out
end

local function diamond(n)
    local rows = topPyramid(n)
    for i = n - 1, 1, -1 do
        rows[#rows + 1] = rows[i]
    end
    return table.concat(rows, "\n")
end
local p = getplayerbyname("diam01")
sendmsg(p, 1, diamond(3))