Codectionary / Developer documentation / Lua

Lua error and assert

Lua reference for lua error and assert.

Syntax

assert(type(id) == "number", "id must be a number")
if not ready then error("Not ready") end

Examples

Lua error and assert example

A focused example you can adapt while practising.

assert(type(id) == "number", "id must be a number")
if not ready then error("Not ready") 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