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node_modules/rxjs/_esm2015/operators/take.js

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+import { Subscriber } from '../Subscriber';
+import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
+import { EmptyObservable } from '../observable/EmptyObservable';
+/**
+ * Emits only the first `count` values emitted by the source Observable.
+ *
+ * <span class="informal">Takes the first `count` values from the source, then
+ * completes.</span>
+ *
+ * <img src="./img/take.png" width="100%">
+ *
+ * `take` returns an Observable that emits only the first `count` values emitted
+ * by the source Observable. If the source emits fewer than `count` values then
+ * all of its values are emitted. After that, it completes, regardless if the
+ * source completes.
+ *
+ * @example <caption>Take the first 5 seconds of an infinite 1-second interval Observable</caption>
+ * var interval = Rx.Observable.interval(1000);
+ * var five = interval.take(5);
+ * five.subscribe(x => console.log(x));
+ *
+ * @see {@link takeLast}
+ * @see {@link takeUntil}
+ * @see {@link takeWhile}
+ * @see {@link skip}
+ *
+ * @throws {ArgumentOutOfRangeError} When using `take(i)`, it delivers an
+ * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
+ *
+ * @param {number} count The maximum number of `next` values to emit.
+ * @return {Observable<T>} An Observable that emits only the first `count`
+ * values emitted by the source Observable, or all of the values from the source
+ * if the source emits fewer than `count` values.
+ * @method take
+ * @owner Observable
+ */
+export function take(count) {
+    return (source) => {
+        if (count === 0) {
+            return new EmptyObservable();
+        }
+        else {
+            return source.lift(new TakeOperator(count));
+        }
+    };
+}
+class TakeOperator {
+    constructor(total) {
+        this.total = total;
+        if (this.total < 0) {
+            throw new ArgumentOutOfRangeError;
+        }
+    }
+    call(subscriber, source) {
+        return source.subscribe(new TakeSubscriber(subscriber, this.total));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class TakeSubscriber extends Subscriber {
+    constructor(destination, total) {
+        super(destination);
+        this.total = total;
+        this.count = 0;
+    }
+    _next(value) {
+        const total = this.total;
+        const count = ++this.count;
+        if (count <= total) {
+            this.destination.next(value);
+            if (count === total) {
+                this.destination.complete();
+                this.unsubscribe();
+            }
+        }
+    }
+}
+//# sourceMappingURL=take.js.map