# Groupby on an expression or a vector?

**URL:** <https://discourse.julialang.org/t/groupby-on-an-expression-or-a-vector/115409>\
**Category:** New to Julia\
**Created:** [June 10, 2024, 4:33am UTC](https://discourse.julialang.org/t/groupby-on-an-expression-or-a-vector/115409 "2024-06-10T04:33:32Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![rocco\_sprmnt21](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rocco_sprmnt21/32/20127_2.png) [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Post date:** [June 11, 2024, 1:35pm UTC](https://discourse.julialang.org/t/groupby-on-an-expression-or-a-vector/115409/22 "2024-06-11T13:35:19Z")

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the [SplitApplyCombine](https://github.com/JuliaData/SplitApplyCombine.jl) package has this feature

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**Author:** ![Chriz\_Zend](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chriz_zend/32/209871_2.png) [@Chriz\_Zend](https://discourse.julialang.org/u/Chriz_Zend)\
**Post date:** [June 11, 2024, 2:05pm UTC](https://discourse.julialang.org/t/groupby-on-an-expression-or-a-vector/115409/23 "2024-06-11T14:05:43Z")

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Indeed, _groupcount_ to count each group that is the result of a function…  
An interesting module…  
Thank you. 🙂

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