# Best practice for argument type declarations?

**URL:** <https://discourse.julialang.org/t/best-practice-for-argument-type-declarations/80194>\
**Category:** General Usage\
**Tags:** question\
**Created:** [April 28, 2022, 9:29am UTC](https://discourse.julialang.org/t/best-practice-for-argument-type-declarations/80194 "2022-04-28T09:29:08Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![nilshg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nilshg/32/2283_2.png) [@nilshg](https://discourse.julialang.org/u/nilshg)\
**Post date:** [April 28, 2022, 9:33am UTC](https://discourse.julialang.org/t/best-practice-for-argument-type-declarations/80194/2 "2022-04-28T09:33:31Z")

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> [@Annotating Types: Best practice for beginners](https://discourse.julialang.org/t/annotating-types-best-practice-for-beginners/50521):
>
> As a beginner I’m slightly unsure of when I should be annotating my code with types. I’ve read the section on types in the Julia manual and I’m happy with the basics (type hierarchy, parametric types, avoiding abstract types, and the importance of type stability) but I’m still slightly unsure how I should using type annotations in practice. For instance, from the QuantEcon website: You will notice that in the lecture notes we have never directly declared any types. This is intentional both fo…

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