ingredients : Array
additionalIngredients : Array
In my code, I have two different methods for subscribing:
this.ingredients.valueChanges.subscribe(val=> {
console.log(val);
}
this.additionalIngredients.valueChanges.subscribe(val2=> {
console.log(val2);
}
I am looking to combine val and val2 in a single function. How can I achieve this? (or perhaps create val3 which is the sum of val and val2)
When you use combineLatest, you'll get the most up-to-date values of both toppings and toppings2.
Learn more about combineLatest here.
Check out the marble diagram for combineLatest: View the diagram here.
See an example below:
import {combineLatest} from 'rxjs';
combineLatest(this.toppings.valueChanges, this.toppings2.valueChanges )
.subscribe( ([topping1val, topping2val]) => {
let topping3 = topping1val + topping2val;
});
zip brings together two observables and waits for both of them to emit. Alternatively, combineLatest can achieve the same outcome regardless of the approach you choose.
zip(this.toppings.valueChanges, this.toppings2.valueChanges).subscribe(val => console.log(val[0] + val[1]))
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