# How to get all combinations from multiple input arrays?
**URL:** https://discourse.julialang.org/t/how-to-get-all-combinations-from-multiple-input-arrays/100010
**Category:** General Usage
**Tags:** question
**Created:** [June 7, 2023, 3:15pm UTC](https://discourse.julialang.org/t/how-to-get-all-combinations-from-multiple-input-arrays/100010 "2023-06-07T15:15:52Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@ejmeitz](https://discourse.julialang.org/u/ejmeitz)
#### Post date: [June 7, 2023, 3:15pm UTC](https://discourse.julialang.org/t/how-to-get-all-combinations-from-multiple-input-arrays/100010/1 "2023-06-07T15:15:52Z")
Hello,
Say I have three input arrays like the ones below (could be arbitrary amount) and I want to generate all possible combinations of values with one entry from each array. The existing functions in Combinatorics.jl only work with one array (e.g. [:a, 1, “hi”], [:a,1,“bye”], [:a,2,“hi”]). If I knew I would always have three arrays I could just loop but I do not know beforehand if I will have 2 or 3 or 4 etc arrays to generate combinations from. Is there any way to do this that I’m just missing or some package I don’t know of?
Thanks!
```julia
letters = [:a, :b, :c]
numbers = [1,2,3]
other = ["hi", "bye"]
```
---
### Author:  [@stillyslalom](https://discourse.julialang.org/u/stillyslalom)
#### Post date: [June 7, 2023, 3:24pm UTC](https://discourse.julialang.org/t/how-to-get-all-combinations-from-multiple-input-arrays/100010/2 "2023-06-07T15:24:18Z")
```julia
julia> allcombinations(v...) = vec(collect(Iterators.product(v...)))
allcombinations (generic function with 1 method)
julia> allcombinations(letters, numbers, other)
18-element Vector{Tuple{Symbol, Int64, String}}:
(:a, 1, "hi")
(:b, 1, "hi")
(:c, 1, "hi")
(:a, 2, "hi")
(:b, 2, "hi")
(:c, 2, "hi")
(:a, 3, "hi")
(:b, 3, "hi")
(:c, 3, "hi")
(:a, 1, "bye")
(:b, 1, "bye")
(:c, 1, "bye")
(:a, 2, "bye")
(:b, 2, "bye")
(:c, 2, "bye")
(:a, 3, "bye")
(:b, 3, "bye")
(:c, 3, "bye")
```
---
### Author:  [@ejmeitz](https://discourse.julialang.org/u/ejmeitz)
#### Post date: [June 7, 2023, 3:25pm UTC](https://discourse.julialang.org/t/how-to-get-all-combinations-from-multiple-input-arrays/100010/3 "2023-06-07T15:25:46Z")
Thank you!
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [June 7, 2023, 3:49pm UTC](https://discourse.julialang.org/t/how-to-get-all-combinations-from-multiple-input-arrays/100010/4 "2023-06-07T15:49:25Z")
Note that you generally want to avoid `collect` which materialises the iterator if you can avoid it.