从表中随机选择一项 [英] Choose a random item from a table

问题描述

我的目标是从 Lua 的表格中随机挑选一个项目.

My goal is to pick out a random item from a table in Lua.

这是我到目前为止所得到的，但目前不起作用:

This is what I've got so far, but it currently does not work:

local myTable = { 'a', 'b', 'c', 'd' }
print( myTable[ math.random( 0, #myTable - 1 ) ] )

如何修复上述代码以使其按预期工作?(或者我可以使用哪种其他方法?)

How can I fix the above code so that it works as intended? (Or which other method could I use?)

推荐答案

Lua 从 1 开始索引表，不像 C、Java 等从 0 开始索引数组.这意味着，在你的表中，有效索引是:1，2, 3, 4. 您要查找的是以下内容:

Lua indexes tables from 1, unlike C, Java etc. which indexes arrays from 0. That means, that in your table, the valid indexes are: 1, 2, 3, 4. What you are looking for is the following:

print( myTable[ math.random( #myTable ) ] )

当用一个参数调用时，math.random(n) 返回一个从 1 到 n 的随机整数，包括.

When called with one argument, math.random(n) returns a random integer from 1 to n including.

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