# List of elements with unknown type, is it bad?

**URL:** <https://discourse.julialang.org/t/list-of-elements-with-unknown-type-is-it-bad/53893>\
**Category:** New to Julia\
**Tags:** question\
**Created:** [January 25, 2021, 9:44am UTC](https://discourse.julialang.org/t/list-of-elements-with-unknown-type-is-it-bad/53893 "2021-01-25T09:44:18Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![rveltz](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rveltz/32/2707_2.png) [@rveltz](https://discourse.julialang.org/u/rveltz)\
**Post date:** [January 25, 2021, 1:06pm UTC](https://discourse.julialang.org/t/list-of-elements-with-unknown-type-is-it-bad/53893/3 "2021-01-25T13:06:23Z")

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> that is a concrete type

I add forgotten that. For me, `Any` is (was) bad.

> I suggest you look at [this recent answer of mine](https://discourse.julialang.org/t/type-stability-problem-vcat-tuple-and-function/53862/5) about how to limit the damage cause by type-instability.

Thanks

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