# Short-hand for defining methods
**URL:** https://discourse.julialang.org/t/short-hand-for-defining-methods/9707
**Category:** New to Julia
**Created:** [March 14, 2018, 3:38am UTC](https://discourse.julialang.org/t/short-hand-for-defining-methods/9707 "2018-03-14T03:38:39Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@amrods](https://discourse.julialang.org/u/amrods)
#### Post date: [March 14, 2018, 3:38am UTC](https://discourse.julialang.org/t/short-hand-for-defining-methods/9707/1 "2018-03-14T03:38:39Z")
Is there a way to define something like `f(a::AbstractArray, b::AbstractArray, ...)` without having to repeat the type each time?
I know I could do `f(a::T, b::T, ...) where T <: AbstractArray` but that would restrict all the arguments to be of the same type.
---
### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [March 14, 2018, 4:13am UTC](https://discourse.julialang.org/t/short-hand-for-defining-methods/9707/2 "2018-03-14T04:13:51Z")
`f(a,b,...)`. As an added bonus you get duck typing for free.
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### Author:  [@tkoolen](https://discourse.julialang.org/u/tkoolen)
#### Post date: [March 14, 2018, 5:03am UTC](https://discourse.julialang.org/t/short-hand-for-defining-methods/9707/3 "2018-03-14T05:03:00Z")
You could do something like
```julia
const AA = AbstractArray
f(a::AA, b::AA) = a .+ b
```
or
```julia
let T = AbstractArray
global f(a::T, b::T) = a .+ b
end
```
---
### Author:  [@amrods](https://discourse.julialang.org/u/amrods)
#### Post date: [March 14, 2018, 7:20am UTC](https://discourse.julialang.org/t/short-hand-for-defining-methods/9707/4 "2018-03-14T07:20:23Z")
Thanks for the suggestions. @ChrisRackauckas’ is very insightful 😛 I was thinking more of a metaprogramming way, which I don’t know much about.