# Help with defining macros
**URL:** https://discourse.julialang.org/t/help-with-defining-macros/84206
**Category:** General Usage
**Tags:** question, macros
**Created:** [July 14, 2022, 5:54am UTC](https://discourse.julialang.org/t/help-with-defining-macros/84206 "2022-07-14T05:54:11Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@math\_opt](https://discourse.julialang.org/u/math_opt)
#### Post date: [July 14, 2022, 5:54am UTC](https://discourse.julialang.org/t/help-with-defining-macros/84206/1 "2022-07-14T05:54:11Z")
I have a `struct` as follows:
```julia
@kwdef struct Node
index
value
optional_attribute = 0.0
end
@kwdef struct Network
nodes::Vector{node} = Node[]
end
```
Now, I can define a `Network` object and assign `nodes` to it. However, I want to do it a bit differently using macros. Something like:
```julia
#Initialize a network
V = Network()
#Now fill in the nodes using macro
@node(V, 1, 10) #index=1, value=2
@node(V, 2, 20, optional_attribute=5)
#and so on
```
How do I define this macro `@node`. Also, since `node` belongs to `V`, I should be later able to retrieve it using `V.nodes`. This is probably a trivial question but I have never used macros before hence the question. Any help is appreciated. Thank you.
---
### Author:  [@skleinbo](https://discourse.julialang.org/u/skleinbo)
#### Post date: [July 14, 2022, 6:33am UTC](https://discourse.julialang.org/t/help-with-defining-macros/84206/2 "2022-07-14T06:33:51Z")
Why would you want to use a macro? The job of macros is to transform expressions before run time.
A function will do the trick.
```julia
node!(V::Network, i,v; kwargs...) = push!(V.nodes, Node(;(index=i,value=v,kwargs...)...))
```
---
### Author:  [@math\_opt](https://discourse.julialang.org/u/math_opt)
#### Post date: [July 14, 2022, 6:50am UTC](https://discourse.julialang.org/t/help-with-defining-macros/84206/3 "2022-07-14T06:50:16Z")
I guess you’re right. Your function would do the trick and macro is probably overkill here. I am just learning about macros and was trying to give it a shot here. Is it possible at all here? If yes, how would you do that? (I understand this is a bad use case though as you said)
Thanks.
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [July 14, 2022, 7:04am UTC](https://discourse.julialang.org/t/help-with-defining-macros/84206/4 "2022-07-14T07:04:42Z")
Mandatory link:
[ ](https://www.youtube.com/watch?v=mSgXWpvQEHE&t=580)
---
### Author:  [@math\_opt](https://discourse.julialang.org/u/math_opt)
#### Post date: [July 14, 2022, 7:07am UTC](https://discourse.julialang.org/t/help-with-defining-macros/84206/5 "2022-07-14T07:07:34Z")
Haha. OK. Thanks for the link 😅