Ionic - Condition in which if the field already exists it will be added again

Question

I have a question on Ionic, I’m trying to do that if the field that would be the zip code is already in the table it will automatically fill the rest with what has already been typed in this zip code.

Home.pagets.

export class HomePage {
  public cep;
  public endereco;
  public cidade;
  public uf;
  public campos =  [{cep: '5555',
  endereco:'99999', cidade: 'Itapeva', uf: 'SP'}
  ];


  adicionar():void{
    this.campos.push({cep: this.cep, endereco: this.endereco, cidade: this.cidade, uf: this.uf });
    
  }
}