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Update generalized-iteration.md

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Arseny Kapoulkine 2022-02-01 20:42:55 -08:00 • committed by GitHub
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@ -36,7 +36,7 @@ This is a general mechanism that can support iteration through many containers,
Thus, today the loop `for k, v in tab do` effectively executes `k, v = tab()` on the first iteration, which is why it yields `attempt to call a table value`. If the object defines `__call` metamethod then it can act as a self-iterating method, but this is not idiomatic, not efficient and not pure/clean. Thus, today the loop `for k, v in tab do` effectively executes `k, v = tab()` on the first iteration, which is why it yields `attempt to call a table value`. If the object defines `__call` metamethod then it can act as a self-iterating method, but this is not idiomatic, not efficient and not pure/clean.
This proposal comes in two pars: general support for `__iter` metamethod and default implementation for tables without one. After this proposal, there's going to be a single, idiomatic, general and performant way to iterate through the object of any type: This proposal comes in two parts: general support for `__iter` metamethod and default implementation for tables without one. With both of these in place, there's going to be a single, idiomatic, general and performant way to iterate through the object of any type:
```lua ```lua
for k, v in obj do for k, v in obj do