splice 方法删除两个数组中的元素

Question

I have the following error. When I use splice in 1 array, it deletes the element in both arrays. Code:

export class AgendarpacientesComponent implements OnInit {
   arrayPrueba: number[]=[1,2,3,4,5]
}

constructor(){
  this.metodo();
}
ngOnInit() {}

metodo(){
  let arrayAux = this.arrayPrueba;
  arrayAux.splice(1,1);
  console.log(this.arrayPrueba);
}

the result of console log is: [1,3,4,5] and I've used the splice method only on arrayAux. I don't know why this is happening.

Thanks for helping !

Answer 1

You have two references to the same array. Changes made to any reference, affect the same object. Use something like spread operator to make a copy :

let arrayAux = [...this.arrayPrueba];