Maybe this is a better way to build what you want.
String streamContents: [:stream |
  gifts 
    do: [:each | stream nextPutAll: each ]
    separatedBy: [ stream nextPut: $,; space ]
]

Esteban A. Maringolo


On Thu, May 16, 2019 at 4:21 PM Roelof Wobben <r.wobben@home.nl> wrote:
Hello,

Im testing all my solutions with critiz and can solve almost all problems,

Only this one I cannot figure out.

I have this code
(gifts allButLast
                inject: ''
                into: [ :str :each | str , each , ', ' ]) , 'and ' , gifts last ]

and critiz says I should use a stream .

How can I make this work ? 

Roelof