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operators
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Editing: distinctUntilChanged.js
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import { identity } from '../util/identity'; import { operate } from '../util/lift'; import { createOperatorSubscriber } from './OperatorSubscriber'; export function distinctUntilChanged(comparator, keySelector = identity) { comparator = comparator !== null && comparator !== void 0 ? comparator : defaultCompare; return operate((source, subscriber) => { let previousKey; let first = true; source.subscribe(createOperatorSubscriber(subscriber, (value) => { const currentKey = keySelector(value); if (first || !comparator(previousKey, currentKey)) { first = false; previousKey = currentKey; subscriber.next(value); } })); }); } function defaultCompare(a, b) { return a === b; } //# sourceMappingURL=distinctUntilChanged.js.map
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