Re: Adding direct enumeration of collections to Lua generic for loops

[Daurnimator <quae@...>]

On 4 April 2018 at 04:15, Jean-Luc Jumpertz <jean-luc@celedev.eu> wrote:
> Direct for..in enumeration can be customized by defining a "__forgen" (for generator) metamethod that shall return the 3 values needed by the generic for loop: an iterator function, a state, and the initial value of the iterator variable.
>
> If no "__forgen" metamethod is defined and the collection is a Lua table, direct for..in enumeration is equivalent to calling the standard Lua library function pair().

Must be that time of the year for the __iter proposal :P
See https://duckduckgo.com/?q=inurl%3Alua-users.org%2Flists%2Flua-l%2F+"__iter";

Generally the outcome is:
  - Lua used to do bare iteration but removed it
  - There are often multiple ways to iterate an object (see ipairs vs
pairs). It's limiting to pick just one.
  - You can already do it with  __call