Type assertions

The following functions all perform type checking on their argument. If the received value is not of the right type, the failure message will contain the expected type, the received type and the received value to help you identify better the problem.

• _AFT.assertIsNumber(value)

  Assert that the argument is a number (integer or float)

  lua _AFT.assertIsNumber(1)

• _AFT.assertIsString(value)

  Assert that the argument is a string.

  lua _AFT.assertIsString("string")

• _AFT.assertIsTable(value)

  Assert that the argument is a table.

  lua _AFT.assertIsTable({key = "value"})

• _AFT.assertIsBoolean(value)

  Assert that the argument is a boolean.

  lua _AFT.assertIsBoolean(false)

• _AFT.assertIsFunction(value)

  Assert that the argument is a function.

  lua _AFT.assertIsFunction(function() print("HELLO WORLD!") end)

• _AFT.assertIsUserdata(value)

  Assert that the argument is a userdata.

  lua _AFT.assertIsUserdata(someCvariableImportedAsUserDataInLua)

• _AFT.assertIsThread(value)

  Assert that the argument is a coroutine (an object with type thread ).

  ```lua local corout = coroutine.create( print )

  _AFT.assertIsUserdata(corout) ```

• _AFT.assertNotIsThread(value)

  Assert that the argument is a not coroutine (an object with type thread ).

  lua _AFT.assertNotIsThread(2)