How to concatenate Strings in a loop

[subramanian0331]

I want to concatenate string as i traverse through a loop.
`
cluster:{
lab1:"val1"
lab2:"val2"
lab3: "val3"
}

payload:{
final : string
for key,val in cluster{
key + final
}
}

`

[slewiskelly]

In CUE all concrete values are final, so you cannot concatenate. However, it seems like you can use strings.Join:

import "strings"

cluster: {
	lab1: "val1"
	lab2: "val2"
	lab3: "val3"
}

payload: {
	final: strings.Join([ for k, _ in cluster {k}], "") // Results in "lab1lab2lab3".
}

When creating issues and/or discussion, I would suggest you clearly show what you expect/want to achieve, along with your examples.

Also, for future reference, here is a guide for formatting markdown in GitHub. This will be useful to better format issues/descriptions.