# Extract argument names

**URL:** <https://discourse.julialang.org/t/extract-argument-names/862>\
**Category:** Internals & Design\
**Tags:** question\
**Created:** [December 11, 2016, 2:37pm UTC](https://discourse.julialang.org/t/extract-argument-names/862 "2016-12-11T14:37:36Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [December 11, 2016, 5:56pm UTC](https://discourse.julialang.org/t/extract-argument-names/862/2 "2016-12-11T17:56:20Z")

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> [@Tamas\_Papp](#):
>
> 1. should work for closures (they always have one method, right)?

No, you can add methods to an anonymous function using call overloading

```julia
f = (x) -> x^2
(T::typeof(f))(x,y) = x^2 + y^2

```

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