Concatenate lists with if statement

[PierreAdrienDelisle]

Hello, sorry if the question seems stupid but I had a problem understanding how to solve a problem I had. I want to concatenate two lists and the values of those lists depends on a if statement like this :

if lb != null {
  let lbDep = ["value"]
}
if ub != null {
  let ubDep = ["secVal"]
}
dep: lbDep+ ubDep

The problem here is that they (lbDep/ubDep) arent't in the scope of the var "dep".
But if I initialize them with [] (empty array), I get a "conflicting values" error.

lbDep: []
if lb != null {
  lbDep = ["value"]
}
ubDep:[]
if ub != null {
  ubDep = ["secVal"]
}
dep: lbDep+ ubDep

How is it possible to overcome this or re-define an existing value?
Thanks!

[verdverm]

• try initializing with lbDep: [...]. [] is an empty list while [...] is a list of unknown elements
• a list.FlattenN in the stdlib too

[PierreAdrienDelisle]

I was able to do what I wanted thanks to you guys ! I didn't know for the [...] as I'm a beginner
For people having the same struggle here it is:

lb: null
ub: "test"

lbDep: [...]
if lb != null {
  lbDep: ["value"]
}
ubDep:[...]
if ub != null {
  ubDep: ["secVal"]
}
dep: lbDep + ubDep

[mpvl]

On tip, at least, you can do this:

dep: [
    if lb != null {
        "value"
    },
    if ub != null {
        "secVal"
    },
]

[cueckoo]

This discussion has been migrated to cue-lang/cue#623.

For more details about CUE's migration to a new home, please see cue-lang/cue#1078.