rxjs/dist/esm5/internal/operators/distinctUntilKeyChanged.js

Reactive Extensions for modern JavaScript

import { distinctUntilChanged } from './distinctUntilChanged';
export function distinctUntilKeyChanged(key, compare) {
    return distinctUntilChanged(function (x, y) { return (compare ? compare(x[key], y[key]) : x[key] === y[key]); });
}
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