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node_modules/rxjs/operator/distinctUntilKeyChanged.js

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+"use strict";
+var distinctUntilKeyChanged_1 = require('../operators/distinctUntilKeyChanged');
+/* tslint:enable:max-line-length */
+/**
+ * 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.
+ *
+ * @example <caption>An example comparing the name of persons</caption>
+ *
+ *  interface Person {
+ *     age: number,
+ *     name: string
+ *  }
+ *
+ * Observable.of<Person>(
+ *     { age: 4, name: 'Foo'},
+ *     { age: 7, name: 'Bar'},
+ *     { age: 5, name: 'Foo'},
+ *     { age: 6, name: 'Foo'})
+ *     .distinctUntilKeyChanged('name')
+ *     .subscribe(x => console.log(x));
+ *
+ * // displays:
+ * // { age: 4, name: 'Foo' }
+ * // { age: 7, name: 'Bar' }
+ * // { age: 5, name: 'Foo' }
+ *
+ * @example <caption>An example comparing the first letters of the name</caption>
+ *
+ * interface Person {
+ *     age: number,
+ *     name: string
+ *  }
+ *
+ * Observable.of<Person>(
+ *     { age: 4, name: 'Foo1'},
+ *     { age: 7, name: 'Bar'},
+ *     { age: 5, name: 'Foo2'},
+ *     { age: 6, name: 'Foo3'})
+ *     .distinctUntilKeyChanged('name', (x: string, y: string) => x.substring(0, 3) === y.substring(0, 3))
+ *     .subscribe(x => console.log(x));
+ *
+ * // displays:
+ * // { age: 4, name: 'Foo1' }
+ * // { age: 7, name: 'Bar' }
+ * // { age: 5, name: 'Foo2' }
+ *
+ * @see {@link distinct}
+ * @see {@link distinctUntilChanged}
+ *
+ * @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 distinctUntilKeyChanged_1.distinctUntilKeyChanged(key, compare)(this);
+}
+exports.distinctUntilKeyChanged = distinctUntilKeyChanged;
+//# sourceMappingURL=distinctUntilKeyChanged.js.map