I want to read every rate property of my array. I don't know is there any method to call only $values from that rate record ??
I did this to call this array:
async ngOnInit() {
this.product$ = await this.reviewService.getReview(this.product.$key);
this.key = Object.values(this.product.reviews);
}
So you can use the map method to get an array of rates and then use reduce, I mean:
ngOnInit():void{
// get an array of rates
const rates = yourArray.map(item => item.rate) // rates=[2,3,5,1,..]
// use reduce function to calculate the sum
const sum = rates.reduce(this.total)
}
private total(total,num){
return total + num
}