可以在Lua中模拟绑定吗? [英] Is it possible to emulate bind in Lua?

问题描述

给出一个带有一个参数的lua函数，是否可以将此参数绑定到一个固定值以获得不带参数的函数?

Given a lua function with one argument, is it possible to bind this argument to a fixed value to obtain a function without arguments?

更一般而言，如何将lua函数的某些输入参数绑定到某些值?

More generally, how do I bind certain input arguments of a lua function to certain values?

推荐答案

是的，几乎可以使用任何具有一等值功能的语言来完成此操作.

Yes, this can be done in pretty much any language that have functions as first-class values.

function f1(a)
   return a+1
end

function bind(a)
   return function() return f1(a) end
end

local f2 = bind(42)
print(f2())
-- 43

此特定示例适用于特定的函数和参数数量，但可以轻松扩展为采用任意函数/参数.

This particular example works with specific function and number of arguments, but can easily be extended to take arbitrary function/arguments instead.

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