Guide: iterators

[steveklabnik]

An introduction to iterators. I kinda like this, but I kinda don't. Hmmm.

[parir]

s/an/can/

[steveklabnik]

thank you!

[killercup]

Nicely written. I expected to learn two more things though:

• Iterators themselves are lazy
• One can simply implement the Iterator trait by writing a next method that returns Some(next_value) as long as there is stuff to iterate and None at the end.

(Correct me if this is wrong.)

[steveklabnik]

@killercup great point on the lazy, but we haven't actually introduced traits yet, so we can't talk about that. Implementing iterators is out of the scope of this guide, but should certainly go in the broader iterator documentation.

[steveklabnik]

Okay. New draft up. This is significantly different, but addresses all of the problems with the last one. What do we think?

[huonw]

Is the int in Some(int) meant to be the type or meant to be a name binding?

[steveklabnik]

the type.

[huonw]

I like it!

[huonw]

Missing ). Also, looking at it written down, maybe it could be just fold(base, |accumulator, element| ...).

[steveklabnik]

agreed.

[huonw]

To be precise, they're not always new as it repeats after 2⁶⁴ (or 2³²) elements.

[steveklabnik]

I added a sentence here. Once we address #15526 , I'll make it more specific.