update

node_modules/rxjs/operators/skipLast.js

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+"use strict";
+var __extends = (this && this.__extends) || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+};
+var Subscriber_1 = require('../Subscriber');
+var ArgumentOutOfRangeError_1 = require('../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
+ */
+function skipLast(count) {
+    return function (source) { return source.lift(new SkipLastOperator(count)); };
+}
+exports.skipLast = skipLast;
+var SkipLastOperator = (function () {
+    function SkipLastOperator(_skipCount) {
+        this._skipCount = _skipCount;
+        if (this._skipCount < 0) {
+            throw new ArgumentOutOfRangeError_1.ArgumentOutOfRangeError;
+        }
+    }
+    SkipLastOperator.prototype.call = function (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_1.Subscriber(subscriber));
+        }
+        else {
+            return source.subscribe(new SkipLastSubscriber(subscriber, this._skipCount));
+        }
+    };
+    return SkipLastOperator;
+}());
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+var SkipLastSubscriber = (function (_super) {
+    __extends(SkipLastSubscriber, _super);
+    function SkipLastSubscriber(destination, _skipCount) {
+        _super.call(this, destination);
+        this._skipCount = _skipCount;
+        this._count = 0;
+        this._ring = new Array(_skipCount);
+    }
+    SkipLastSubscriber.prototype._next = function (value) {
+        var skipCount = this._skipCount;
+        var count = this._count++;
+        if (count < skipCount) {
+            this._ring[count] = value;
+        }
+        else {
+            var currentIndex = count % skipCount;
+            var ring = this._ring;
+            var oldValue = ring[currentIndex];
+            ring[currentIndex] = value;
+            this.destination.next(oldValue);
+        }
+    };
+    return SkipLastSubscriber;
+}(Subscriber_1.Subscriber));
+//# sourceMappingURL=skipLast.js.map