如何在ROBLOX Lua中制作加权RNG？ （如CS：GO案例）

Question

说我有一张像这样的表：

skins = {desert_camouflage = 10, forest_camouflage = 20}

“desert_camouflage”的加权比“forest_camouflage”稀少。

我正在搜索一个Rbx.Lua RNG函数，它会打印出它的结果。

Answer 1

我不这么认为，但自己写得很容易：

function(weights)
  local sum = 0
  for _, v in next, weights do
    if v < 0 or math.floor(v) ~= v then
      error "Weights must be non-negative integers"
    end
    sum = sum + v
  end
  sum = math.random(sum)
  for k, v in next, weights do
    sum = sum - v
    if sum <= 0 then
      return k
    end
  end
  error "Should not happen."
end

Answer 2

试试我的解决方案：

function weighted_random (weights)
    local summ = 0
    for i, weight in pairs (weights) do
        summ = summ + weight
    end
    if summ == 0 then return end
    local value = math.random (summ)
    summ = 0
    for i, weight in pairs (weights) do
        summ = summ + weight
        if value <= summ then
            return i, weight
        end
    end
end