lua - 你能在 Lua 中创建匿名代码块吗？

Question

在诸如 C 之类的编程语言中，您可以创建一个匿名代码块来将变量的范围限制在 block 内，Lua 也可以这样做吗？

如果是这样，以下 C 代码的 Lua 等效项是什么？

void function()
{
    {
        int i = 0;
        i = i + 1;
    }

    {
        int i = 10;
        i = i + 1;
    }
}

Answer 1

您想使用 do...end .来自 manual :

A block can be explicitly delimited to produce a single statement:

stat ::= do block end

Explicit blocks are useful to control the scope of variable declarations. Explicit blocks are also sometimes used to add a return or break statement in the middle of another block

function fn()
    do
        local i = 0
        i = i + 1
    end
    do
        local i = 10
        i = i + 1
    end
end