# Using @eval in a function

**URL:** https://discourse.julialang.org/t/using-eval-in-a-function/89488
**Category:** General Usage
**Tags:** macros, metaprogramming, eval, world\_age
**Created:** [October 29, 2022, 11:47am UTC](https://discourse.julialang.org/t/using-eval-in-a-function/89488 "2022-10-29T11:47:35Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![dlakelan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dlakelan/32/8491_2.png) [@dlakelan](https://discourse.julialang.org/u/dlakelan)
#### Post date: [October 29, 2022, 3:45pm UTC](https://discourse.julialang.org/t/using-eval-in-a-function/89488/5 "2022-10-29T15:45:46Z")

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I think you’re dealing with a “world age” issue.

> [@World Age Problem Explanation](https://discourse.julialang.org/t/world-age-problem-explanation/9714):
>
> Hello. Recently I have faced the “world age problem” several times. That means, after searching for my problems, this website came up with themes like “world age workaround” or “How to Bypass the World Age Problem”. I am not a computer scientist, so maybe this is a stupid question, but I have not found a explanation of this problem; where can I get information what actually happens there? Or, more clearly, what is the “World Age Problem”? As you can imagine, if I google this, I get a lot of i…

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