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node_modules/rxjs/_esm2015/operators/skipLast.js

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+import { Subscriber } from '../Subscriber';
+import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
+/**
+ * Skip the last `count` values emitted by the source Observable.
+ *
+ * <img src="./img/skipLast.png" width="100%">
+ *
+ * `skipLast` returns an Observable that accumulates a queue with a length
+ * enough to store the first `count` values. As more values are received,
+ * values are taken from the front of the queue and produced on the result
+ * sequence. This causes values to be delayed.
+ *
+ * @example <caption>Skip the last 2 values of an Observable with many values</caption>
+ * var many = Rx.Observable.range(1, 5);
+ * var skipLastTwo = many.skipLast(2);
+ * skipLastTwo.subscribe(x => console.log(x));
+ *
+ * // Results in:
+ * // 1 2 3
+ *
+ * @see {@link skip}
+ * @see {@link skipUntil}
+ * @see {@link skipWhile}
+ * @see {@link take}
+ *
+ * @throws {ArgumentOutOfRangeError} When using `skipLast(i)`, it throws
+ * ArgumentOutOrRangeError if `i < 0`.
+ *
+ * @param {number} count Number of elements to skip from the end of the source Observable.
+ * @returns {Observable<T>} An Observable that skips the last count values
+ * emitted by the source Observable.
+ * @method skipLast
+ * @owner Observable
+ */
+export function skipLast(count) {
+    return (source) => source.lift(new SkipLastOperator(count));
+}
+class SkipLastOperator {
+    constructor(_skipCount) {
+        this._skipCount = _skipCount;
+        if (this._skipCount < 0) {
+            throw new ArgumentOutOfRangeError;
+        }
+    }
+    call(subscriber, source) {
+        if (this._skipCount === 0) {
+            // If we don't want to skip any values then just subscribe
+            // to Subscriber without any further logic.
+            return source.subscribe(new Subscriber(subscriber));
+        }
+        else {
+            return source.subscribe(new SkipLastSubscriber(subscriber, this._skipCount));
+        }
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SkipLastSubscriber extends Subscriber {
+    constructor(destination, _skipCount) {
+        super(destination);
+        this._skipCount = _skipCount;
+        this._count = 0;
+        this._ring = new Array(_skipCount);
+    }
+    _next(value) {
+        const skipCount = this._skipCount;
+        const count = this._count++;
+        if (count < skipCount) {
+            this._ring[count] = value;
+        }
+        else {
+            const currentIndex = count % skipCount;
+            const ring = this._ring;
+            const oldValue = ring[currentIndex];
+            ring[currentIndex] = value;
+            this.destination.next(oldValue);
+        }
+    }
+}
+//# sourceMappingURL=skipLast.js.map