How to delete an item in an immutable signal array or a key/value in a signal object?

To update items into an immutable array, we can easily do:

array = signal([1,2,3]);
...

...
this.array.update(item => [ ...item, 'newItem' ]);


To update items into an immutable object easily do:

object = signal({});
...

...
this.object.update(obj => ({ ...obj, key :'newValue' }))


But how to delete some items of an array. Also please refer to demo@stackblitz

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