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Lua __newindex metamethod

Lua reference for lua __newindex metamethod.

Syntax

setmetatable(user, {
  __newindex = function(t, key, value) rawset(t, key, value) end
})

Examples

Lua __newindex metamethod example

A focused example you can adapt while practising.

setmetatable(user, {
  __newindex = function(t, key, value) rawset(t, key, value) end
})

Best practices

  • Start with the smallest working example, then adapt it to your project.
  • Use the language’s standard library and idioms before introducing extra dependencies.

Runtime & versions

Lua interpreter or a host application. Feature availability depends on the language and runtime version used by your project; consult the official reference below.

Lua reference manuals

Specifications & further reading