# How to get a typed empty array?
**URL:** https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206
**Category:** General Usage
**Tags:** question, makie
**Created:** [April 8, 2022, 4:14am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206 "2022-04-08T04:14:19Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Katamari](https://discourse.julialang.org/u/Katamari)
#### Post date: [April 8, 2022, 4:14am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206/1 "2022-04-08T04:14:20Z")
I need an empty array with type Tuple{Float64} to solve the following problem.
I want to scatter points using CairoMakie.
The following code works:
```julia
using CairoMakie
scatter([(1, 1)])
```
The following code doesn’t work:
```julia
using CairoMakie
a=[]
push!(a, (1, 1))
scatter(a)
```
I want to use an empty array here because I will push elements using for loop next.
I think I need something like `a=[]::Array{Tuple{Float64}}` but it doesn’t work.
---
### Author:  [@vettert](https://discourse.julialang.org/u/vettert)
#### Post date: [April 8, 2022, 4:26am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206/2 "2022-04-08T04:26:37Z")
This should work:
```julia
using CairoMakie
a = Array{Tuple{Float64, Float64}}(undef, 1)
for i in 1:5
push!(a, (i, i))
end
scatter(a)
```
Note that I have assumed that your data are of type `Float64` in general.
---
### Author:  [@mrs504aa](https://discourse.julialang.org/u/mrs504aa)
#### Post date: [April 8, 2022, 4:27am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206/3 "2022-04-08T04:27:08Z")
```julia
julia> A = Tuple{Int64,Int64}[]
Tuple{Int64, Int64}[]
julia> push!(A, (1,1))
1-element Vector{Tuple{Int64, Int64}}:
(1, 1)
julia> A[1]
(1, 1)
```
Maybe this is what you need.
---
### Author:  [@DNF](https://discourse.julialang.org/u/DNF)
#### Post date: [April 8, 2022, 5:16am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206/4 "2022-04-08T05:16:21Z")
> [@vettert](#):
>
> ```julia
> a = Array{Tuple{Float64, Float64}}(undef, 1)
>
> ```
If you are going to `push!` to it, then the size should be zero, not one. Otherwise, there will remain a garbage value at the first index.
---
### Author:  [@vettert](https://discourse.julialang.org/u/vettert)
#### Post date: [April 8, 2022, 5:25am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206/5 "2022-04-08T05:25:56Z")
Sorry, my bad! You are of course right 🙂
---
### Author:  [@photor](https://discourse.julialang.org/u/photor)
#### Post date: [April 8, 2022, 9:19am UTC](https://discourse.julialang.org/t/how-to-get-a-typed-empty-array/79206/6 "2022-04-08T09:19:44Z")
Then
```julia
a = Array{Tuple{Float64, Float64}}(undef, 0)
```
will be what you need.