Lua迭代器到数组 [英] Lua iterator to array

问题描述

用Lua的话来说，是否有任何语法糖可以将迭代器函数转换成数组(重复调用，结果存储在升序索引中)，也许是标准库中的东西?

In Lua parlance, is there any syntactic sugar for turning an iterator function into an array (repeated invocations with results stored in ascending indices), perhaps something in the standard library ?

我要标记属于协议的字符串，并且需要在字符串的开头位置访问元素，而字符串的结尾是一个变体集合.

I'm tokenizing a string belonging to a protocol and need to to have positional access to elements at the start of the string, and the end of the string is a variant collection.

代码(特定于我的用例)如下，我很难相信它不在标准库中:d

The code (specific to my use-case) is as follows, I find it hard to believe that it isn't in the standard library :d

local array_tokenise = function (line)
    local i = 1;
    local array = {};

    for item in string.gmatch(line,"%w+") do
      array[i] = item;
      i = i +1
    end

    return array
  end

推荐答案

没有标准库函数.但实际上，编写起来很简单:

There's no standard library function for it. But really, it's pretty trivial to write:

function BuildArray(...)
  local arr = {}
  for v in ... do
    arr[#arr + 1] = v
  end
  return arr
end

local myArr = BuildArray(<iterator function call>)

如果您的迭代器函数返回单个元素，这将仅 起作用.如果它返回多个元素，则必须做一些不同的事情.

This will only work if your iterator function returns single elements. If it returns multiple elements, you'd have to do something different.

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