Add values from an array brought from firebase and display them in a label

[Elermino Sacce]

I am doing my project in ionic 6 with angular and a firebase database. I need a typescript function that adds the values fetched from an array that are extracted from a collection in firebase.

  async getGastos() {        const uid = await this.auth.getUid();        const ruta = 'Usuarios/' + uid + '/Gastos';        this.firebaseService.getCollection<Gasto>(ruta).subscribe(res => {            this.gastos = res;            // this.gastos.forEach(gasto => {            //     gasto.monto_gasto;            // });        });        this.setTransc()           }
//Function to fetch the data from the "expenses" collection, the "expense_amount" column and add this data to the "setTransc" function

   async getIngresos() {        const uid = await this.auth.getUid();        const ruta = 'Usuarios/' + uid + '/Ingresos';        this.firebaseService.getCollection<Ingreso>(ruta).subscribe(res => {            this.ingresos = res;            // this.ingresos.forEach(ingreso => {            //     ingreso.monto_ingreso            // });        this.setTransc()        });    }
//Function to fetch the data from the "income" collection, the "expense_amount" column and add this data to the "setTransc" function

   setTransc() {        let sumaGastos = 0;        this.gastos.forEach(gasto => {            sumaGastos += gasto.monto_gasto            console.log("ggg", sumaGastos);        });        let sumaIngresos = 0;        this.ingresos.forEach((ingreso, i) => {            sumaIngresos += ingreso.monto_ingreso            console.log("iii", sumaIngresos);        });    }    async todo(){        await this.getGastos();        await this.getIngresos();    }
"setTransc()" function to sum the values of the array, then the "todo()" function has an await since the elements return a promise before being displayed.

It should be noted that I need to press a button for the values to be operated because I don't know how to do it in the background to show it directly in the label.

[Elermino Sacce]

Campbell Ritchie wrote:Added to our Angular forum.

Thanks, where is that forum?

[Campbell Ritchie]

That's a pleasure
The forum is here; if you look where it says “languages” on your left.