# Structure not created but no error reported
**URL:** https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354
**Category:** New to Julia
**Tags:** question
**Created:** [January 22, 2023, 11:02am UTC](https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354 "2023-01-22T11:02:47Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Bananthahally](https://discourse.julialang.org/u/Bananthahally)
#### Post date: [January 22, 2023, 11:02am UTC](https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354/1 "2023-01-22T11:02:47Z")
Hi folks
I’m not able to get the following to yield the structure for the instance `Tst` described in the REPL further below. No error however is reported by Julia.
```julia
mutable struct CvDv_ForAll_Voids
CvDv_Trapz :: Array{Float64,2}
CvDv_Trian :: Array{Float64,2}
function CvDv_ForAll_Voids(CvDv_Trapz, CvDv_Trian, NTrapz, NTrian)
Case1 = (NTrapz != 0) & (NTrian != 0)
Case2 = (NTrapz != 0) & (NTrian == 0)
Case3 = (NTrapz == 0) & (NTrian != 0)
Case4 = (NTrapz == 0) & (NTrian == 0)
if Case1==1 new(CvDv_Trapz,CvDv_Trian); end
if Case2==1 new(CvDv_Trapz,zeros(1,2)); end
if Case3==1 new(zeros(1,2),CvDv_Trian); end
if Case4==1 new(zeros(1,2),zeros(1,2)); end
end
end
```
Inside the REPL, this is what I created and asked in order to form a strucure called `Tst`:
```julia
julia> A :: Array{Float64,2} = fill(0.75, (4,2))
4×2 Matrix{Float64}:
0.75 0.75
0.75 0.75
0.75 0.75
0.75 0.75
julia> B :: Array{Float64,2} = fill(0.15, (3,2))
3×2 Matrix{Float64}:
0.15 0.15
0.15 0.15
0.15 0.15
julia> Tst = CvDv_ForAll_Voids(A,B,1,1)
julia>
julia> Tst
julia> typeof(Tst)
Nothing
```
I ran the above using the Debugger on VS Code and **did see** that `Case1` was `true` while `Case2`, `Case3` and `Case 4` were all `false`. So still why didn’t the inner constructor function return `Nothing` rather than create the structure fields using the contents of `A` and `B`?
Thanks in advance.
---
### Author:  [@uniment](https://discourse.julialang.org/u/uniment)
#### Post date: [January 22, 2023, 11:13am UTC](https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354/2 "2023-01-22T11:13:37Z")
The first conditional executes and successfully constructs a new object and returns it.
But then the remaining three conditionals execute, and they all return `nothing`.
Most importantly, the final conditional returns `nothing`, and that is then the return value of your inner constructor.
Consider either:
a) using `return` statements
b) using mutually exclusive conditions with `elseif`
Note that you don’t need to compare `true` against `true`; you can simply test `if Case1`. Also, for boolean comparisons it is usually more convenient to use `&&`, which has lower precedence so the equality comparisons don’t need to be parenthesized.
---
### Author:  [@Bananthahally](https://discourse.julialang.org/u/Bananthahally)
#### Post date: [January 22, 2023, 11:30am UTC](https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354/3 "2023-01-22T11:30:28Z")
The conditionals for Case2, Case3 and Case4 should NOT execute because they’re false and NOT satisfied to create the new(…) under them.
Isn’t this how it’s supposed to be ?
---
### Author:  [@uniment](https://discourse.julialang.org/u/uniment)
#### Post date: [January 22, 2023, 11:36am UTC](https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354/4 "2023-01-22T11:36:44Z")
Sorry, I misspoke.
The remaining three conditionals evaluate their conditions, which are `false`. When that occurs, they do not evaluate the code in their body, and return `nothing`.
The point stands though, that you either need to use `return` to terminate the function early, or use mutually exclusive conditionals. Otherwise the last conditional’s return value of `nothing` becomes the function’s return value.
---
### Author:  [@Bananthahally](https://discourse.julialang.org/u/Bananthahally)
#### Post date: [January 22, 2023, 3:49pm UTC](https://discourse.julialang.org/t/structure-not-created-but-no-error-reported/93354/5 "2023-01-22T15:49:01Z")
Thanks, @uniment
I’ll try preceding the new(…) with return and update asap. Also noted your other suggestions.