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node_modules/rxjs/_esm2015/operators/startWith.js

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+import { ArrayObservable } from '../observable/ArrayObservable';
+import { ScalarObservable } from '../observable/ScalarObservable';
+import { EmptyObservable } from '../observable/EmptyObservable';
+import { concat as concatStatic } from '../observable/concat';
+import { isScheduler } from '../util/isScheduler';
+/* tslint:enable:max-line-length */
+/**
+ * Returns an Observable that emits the items you specify as arguments before it begins to emit
+ * items emitted by the source Observable.
+ *
+ * <img src="./img/startWith.png" width="100%">
+ *
+ * @param {...T} values - Items you want the modified Observable to emit first.
+ * @param {Scheduler} [scheduler] - A {@link IScheduler} to use for scheduling
+ * the emissions of the `next` notifications.
+ * @return {Observable} An Observable that emits the items in the specified Iterable and then emits the items
+ * emitted by the source Observable.
+ * @method startWith
+ * @owner Observable
+ */
+export function startWith(...array) {
+    return (source) => {
+        let scheduler = array[array.length - 1];
+        if (isScheduler(scheduler)) {
+            array.pop();
+        }
+        else {
+            scheduler = null;
+        }
+        const len = array.length;
+        if (len === 1) {
+            return concatStatic(new ScalarObservable(array[0], scheduler), source);
+        }
+        else if (len > 1) {
+            return concatStatic(new ArrayObservable(array, scheduler), source);
+        }
+        else {
+            return concatStatic(new EmptyObservable(scheduler), source);
+        }
+    };
+}
+//# sourceMappingURL=startWith.js.map