# \#iterator

**URL:** https://erlangforums.com/tag/iterator/788.md

[Latest](https://erlangforums.com/latest.md) · [Categories](https://erlangforums.com/categories.md) · [Tags](https://erlangforums.com/tags.md)

---

## [Map iteration order](https://erlangforums.com/t/map-iteration-order/5890)

<div class="topic-metadata">

**Author:** [@Maria-12648430](https://erlangforums.com/u/Maria-12648430)\
**Replies:** 1\
**Last updated:** [August 27, 2026, 11:53am UTC](https://erlangforums.com/t/map-iteration-order/5890 "2026-08-27T11:53:38Z")

</div>

The iteration order of an iterator created with maps:iterator(M, undefined) is undefined (yeah, duh). That is fine. I wonder however if that iteration order is guaranteed to be stable, that is, that repeated iterations r…

---

## [Iterator - lazy sequences simulating \`lists\` API (for processing data that does not fit to RAM)](https://erlangforums.com/t/iterator-lazy-sequences-simulating-lists-api-for-processing-data-that-does-not-fit-to-ram/4047)

<div class="topic-metadata">

**Author:** [@seriyps](https://erlangforums.com/u/seriyps)\
**Replies:** 3\
**Last updated:** [February 25, 2025, 4:51pm UTC](https://erlangforums.com/t/iterator-lazy-sequences-simulating-lists-api-for-processing-data-that-does-not-fit-to-ram/4047 "2025-02-25T16:51:02Z")

</div>

This library allows you to work with “too large to fit to RAM” or infinity-long data the same way as you would work with lists using lists module. Let’s say you have a 100Gb text file that has many lines which may or ma…