@reactivex/rxjs/dist/amd/operator/distinctUntilKeyChanged.js

Reactive Extensions for modern JavaScript

define(["require", "exports", './distinctUntilChanged'], function (require, exports, distinctUntilChanged_1) {
    "use strict";
    /**
     * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item,
     * using a property accessed by using the key provided to check if the two items are distinct.
     * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
     * If a comparator function is not provided, an equality check is used by default.
     * @param {string} key string key for object property lookup on each item.
     * @param {function} [compare] optional comparison function called to test if an item is distinct from the previous item in the source.
     * @return {Observable} an Observable that emits items from the source Observable with distinct values based on the key specified.
     * @method distinctUntilKeyChanged
     * @owner Observable
     */
    function distinctUntilKeyChanged(key, compare) {
        return distinctUntilChanged_1.distinctUntilChanged.call(this, function (x, y) {
            if (compare) {
                return compare(x[key], y[key]);
            }
            return x[key] === y[key];
        });
    }
    exports.distinctUntilKeyChanged = distinctUntilKeyChanged;
});
//# sourceMappingURL=distinctUntilKeyChanged.js.map