How does actions update the store?

[khmob]

Both of these give the same result, answeredObject which is part of the state gets updated:

this.answeredObject.map(review => {
                if (this.objects[name]) {
                    object = {
                        key: this.objects[name],
                        time: Date.now().toString(),
                    }
                }
                return review
            })

and

this.answeredObject = this.answeredObject.map(review => {
                if (this.objects[name]) {
                    object = {
                        key: this.objects[name],
                        time: Date.now().toString(),
                    }
                }
                return review
            })

How does that work? In general, map doesn't update the current array, it creates a new one. So how does pinia do that?

[BenShelton]

Pinia doesn't do anything special with map. Your map isn't actually doing anything to the array, it just returns the same object. It looks like the assignment to the object variable (object = ) is what is manipulating something in both cases, and that is probably the update you are actually seeing. This is known as a side effect, where the function is updating something outside of it.