what do 'load' do in Lua?

问题

I was Trying to sove my problem in understanding load function in Lua Scripts but there was not any Examples or guides for this command . it tells in his own Lua Website https://www.lua.org/manual/5.2/manual.html#pdf-load this :

load (ld [, source [, mode [, env]]])

can someone describe it to me please ?

回答1:

load takes a chunk, compiles it, and returns as a function that can be called to execute the chunk. For example, the following will create a function that will add two numbers together:

local func, err = load("return function(a,b) return a+b end")
if func then
  local ok, add = pcall(func)
  if ok then
    print(add(2,3))
  else
    print("Execution error:", add)
  end
else
  print("Compilation error:", err)
end

This should print 5.

来源：https://stackoverflow.com/questions/48629129/what-do-load-do-in-lua