How to clone an array with an object?

Question

JavaScript

There is a function that accepts an array of objects:

setDefault(defaultFilters: Filter[]) {
        this.defaultFilters = defaultFilters;
}

Where, Filter is a class:

export class Filter implements FilterModel {}

How to clone the defaultFilters object ?

Tried like this: this.defaultFilters = {...defaultFilters};

But it doesn't work for class objects.

Full code:

export abstract class FiltersRepository {
    public _filters: Filter[] = [];
    private filtersResponse: Filter[] = [];
    public filters$ = new Subject<Filter[]>();
    private filterUrlBuilder = new FilterUrlBuilder();
    private changes$ = new BehaviorSubject<string>(null);
    private default: Filter[];

    abstract init();

    setDefault(defaultFilters: Filter[]) {
        this.default = defaultFilters.slice();
        this._filters = defaultFilters;
    }

      modifyDefault() {
        this._filters.forEach((_filter) => {
            this.filtersResponse.forEach((responseFilter) => {
                if (_filter.title === responseFilter.title) {
                    if (Array.isArray(responseFilter.collection) && responseFilter.collection.length) {
                        _filter.collection = responseFilter.collection;
                    }
                }
            });
        });
    }
        reset() {
        console.log(this.default);
        this._filters = this.default;
        this.filter();
    }

}

First of all, I call the setDefault method and pass in the default filters. Next, I call modifyDefault which modifies the default filter with values ​​from the database.

Therefore, I am trying to make a clone of the default filters in order to be able to restore them in the reset () method

Answer 1

How to clone the defaultFilters object?

defaultFilters is an array.
If the question is "how to clone an array": defaultFilters.slice();
If the question is "how to clone an array and its contents": where is a method that creates a new instance of this class, copying the parameters. Because just copying public fields is absolutely not enough. defaultFilters.map(instance => instance.clone());clone