Created
March 10, 2019 03:14
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import { from, fromEvent, zip } from 'rxjs'; | |
import { scan } from 'rxjs/operators'; | |
const initialIceCreamFlavors = ['vanilla', 'chocolate', 'strawberry']; | |
const initialIceCreamPrices = ['$5.50', '$5.75', '$6.00']; | |
const iceCreamFormSubmit$ = fromEvent(formEl, 'submit'); | |
const iceCreamFormFlavors$ = iceCreamFormSubmit$.pipe((map(({flavor}) => flavor))); | |
const iceCreamFormPrices$ = iceCreamFormSubmit$.pipe((map(({price}) => price))); | |
const iceCreamFlavors$ = iceCreamFormFlavors$.pipe( | |
scan((prev, flavor) => { | |
return [...prev, flavor]; | |
}, initialIceCreamFlavors), | |
); | |
const iceCreamPrices$ = iceCreamFormPrices$.pipe( | |
scan((prev, price) => { | |
return [...prev, price]; | |
}, initialIceCreamPrices), | |
); | |
const iceCreamFlavorToPrice$ = zip( | |
iceCreamFlavors$, | |
iceCreamPrices$, | |
).pipe(scan((prev, [flavor, price]) => { | |
return { | |
...prev, | |
[flavor]: price | |
}; | |
}, {})); |
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