# Indexing Vectors of Structs
**URL:** https://discourse.julialang.org/t/indexing-vectors-of-structs/87346
**Category:** General Usage
**Created:** [September 16, 2022, 4:39am UTC](https://discourse.julialang.org/t/indexing-vectors-of-structs/87346 "2022-09-16T04:39:15Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Name1](https://discourse.julialang.org/u/Name1)
#### Post date: [September 16, 2022, 4:39am UTC](https://discourse.julialang.org/t/indexing-vectors-of-structs/87346/1 "2022-09-16T04:39:16Z")
Hi all,
```julia
for ii in myStructArray
ii.parameterOne = lowercase(ii.parameterOne)
ii.parameterTwo = lowercase(ii.parameterTwo)
print("On loop iteration " + ii)
end
```
I’m looping through an array of my own custom struct called my MyStruct with the array being called myStructArray. I want to access the numerical value of my FOR loop counter ii based upon it’s position within the array at the FOR loop iteration. Is ii the MyStruct object/struct itself, or is it a numerical value that I can use to reference elements within myStructArray? If it’s the former, can I use ii as if it were a numerical value?
Hope all this make sense. If you need any clarification feel free to ask me.
Thanks.
---
### Author:  [@DNF](https://discourse.julialang.org/u/DNF)
#### Post date: [September 16, 2022, 4:53am UTC](https://discourse.julialang.org/t/indexing-vectors-of-structs/87346/2 "2022-09-16T04:53:10Z")
[if you do this
quote=“Name1, post:1, topic:87346”]
`for ii in myStructArray`
[/quote]
then each `ii` is not an index, but an element of your vector.
If you want the index, you can write
```julia
for ii in eachindex(myStructArray)
```
which is the preferred way, or alternatively, but less general
```julia
for ii in 1:length(myStructArray)
```
I suggest the first alternative.
---
### Author:  [@jar1](https://discourse.julialang.org/u/jar1)
#### Post date: [September 16, 2022, 4:54am UTC](https://discourse.julialang.org/t/indexing-vectors-of-structs/87346/3 "2022-09-16T04:54:11Z")
If you want both the index and the value, you can do
```julia
for (i, x) in pairs(myStructArray)
```