I'm trying to assign an ID to each object in my array, but when I have two or more like objects, they end up getting the same ID.
I already tried to indexOf() and it also did not work.
this.selection.selected.forEach(servico => {
servico.id = this.contador;
this.adicionados.push(servico);
this.contador++;
});
List with different objects - List with 1 repeated object
As I understand it, they are repeated because you are always adding to the same array without first clearing it.
See if the following code solves your problem
const novosAdicionados = [];
this.selection.selected.forEach(servico => {
servico.id = this.contador;
novosAdicionados.push(servico);
this.contador++;
});
this.adicionados = novosAdicionados;
If not, you need to give more information / code to help you.