Angular 2 save unchanged version of a list

Question

I'm subscribing to an API call using the following code:

this.af.database.list("URL")
    .subscribe((lineList) => {
      this.lineList = lineList;
      this.fullLineList = lineList;
});

Whenever I access this.lineList in my component, this.fullLineList changes too.

How I can store a variable which stores lineList and is note affected by this.lineList changes?

score 0 · Accepted Answer · answered Nov 27 '16 at 17:16

With slice() you can create a copy of the list:

this.af.database.list("URL")
.subscribe((lineList) => {
      this.lineList = lineList;
      this.fullLineList = lineList.slice();
});

1 Answers1