# Why isn't Julia written in julia?

**URL:** <https://discourse.julialang.org/t/why-isnt-julia-written-in-julia/74748>\
**Category:** Offtopic\
**Tags:** question\
**Created:** [January 17, 2022, 9:50am UTC](https://discourse.julialang.org/t/why-isnt-julia-written-in-julia/74748 "2022-01-17T09:50:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![matic\_lauko](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/matic_lauko/32/27770_2.png) [@matic\_lauko](https://discourse.julialang.org/u/matic_lauko)\
**Post date:** [January 17, 2022, 9:50am UTC](https://discourse.julialang.org/t/why-isnt-julia-written-in-julia/74748/1 "2022-01-17T09:50:55Z")

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I have seen many other languages, like Rust or Go. I’m no expert, far from that. But, wouldn’t it be useful if it could be optimized for its use case, to work as efficiently as possible. What am I missing?  
Thank you!

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**Author:** ![pixel](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pixel/32/26437_2.png) [@pixel](https://discourse.julialang.org/u/pixel)\
**Post date:** [January 17, 2022, 9:54am UTC](https://discourse.julialang.org/t/why-isnt-julia-written-in-julia/74748/2 "2022-01-17T09:54:34Z")

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> [@Julia written in Julia?](https://discourse.julialang.org/t/julia-written-in-julia/25781):
>
> Is it possible to write Julia completely in Julia using the PackageCompiler? Why is C/C++ needed at the moment? Just curious. slight_smile

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**Author:** ![lawless-m](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lawless-m/32/30869_2.png) [@lawless-m](https://discourse.julialang.org/u/lawless-m)\
**Post date:** [January 17, 2022, 11:11am UTC](https://discourse.julialang.org/t/why-isnt-julia-written-in-julia/74748/3 "2022-01-17T11:11:07Z")

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The specific name for X written in X is “self-hosting”

This thread from 2013 has the reasoning

[https://julia-dev.narkive.com/I7dN7PyT/any-plans-to-get-julia-to-be-fully-self-hosting](https://julia-dev.narkive.com/I7dN7PyT/any-plans-to-get-julia-to-be-fully-self-hosting)