# \#flatmap

**URL:** https://discourse.julialang.org/tag/flatmap/999.md

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## [Iterators.flatmap optimization attempt](https://discourse.julialang.org/t/iterators-flatmap-optimization-attempt/79265)

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**Author:** [@xor0110](https://discourse.julialang.org/u/xor0110)\
**Replies:** 2\
**Last updated:** [April 11, 2022, 11:38am UTC](https://discourse.julialang.org/t/iterators-flatmap-optimization-attempt/79265 "2022-04-11T11:38:47Z")

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Following the nice conversation at #44792 I’m trying to investigate the question of whether flatmap functions might offer performance benefits. I suspect that in general flatten(x) cannot do better than a flatmap(identit…