33 lines
800 B
TypeScript
33 lines
800 B
TypeScript
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import {isPointer, valueDerivation} from '../Atom'
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import type {Pointer} from '../pointer'
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import Ticker from '../Ticker'
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import type {IDerivation} from './IDerivation'
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import {isDerivation} from './IDerivation'
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export default function* iterateOver<V>(
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pointerOrDerivation: IDerivation<V> | Pointer<V>,
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): Generator<V, void, void> {
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let d
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if (isPointer(pointerOrDerivation)) {
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d = valueDerivation(pointerOrDerivation) as IDerivation<V>
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} else if (isDerivation(pointerOrDerivation)) {
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d = pointerOrDerivation
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} else {
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throw new Error(`Only pointers and derivations are supported`)
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}
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const ticker = new Ticker()
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const untap = d.changes(ticker).tap((v) => {})
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try {
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while (true) {
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ticker.tick()
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yield d.getValue()
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}
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} finally {
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untap()
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}
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}
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