@reactivex/rxjs/dist-compat/cjs/src/internal/observable/range.js

Reactive Extensions for modern JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var Observable_1 = require("../Observable");
/**
 * Creates an Observable that emits a sequence of numbers within a specified
 * range.
 *
 * <span class="informal">Emits a sequence of numbers in a range.</span>
 *
 * ![](range.png)
 *
 * `range` operator emits a range of sequential integers, in order, where you
 * select the `start` of the range and its `length`. By default, uses no
 * {@link SchedulerLike} and just delivers the notifications synchronously, but may use
 * an optional {@link SchedulerLike} to regulate those deliveries.
 *
 * ## Example
 * Emits the numbers 1 to 10</caption>
 * ```ts
 * import { range } from 'rxjs';
 *
 * const numbers = range(1, 10);
 * numbers.subscribe(x => console.log(x));
 * ```
 * @see {@link timer}
 * @see {@link index/interval}
 *
 * @param {number} [start=0] The value of the first integer in the sequence.
 * @param {number} count The number of sequential integers to generate.
 * @param {SchedulerLike} [scheduler] A {@link SchedulerLike} to use for scheduling
 * the emissions of the notifications.
 * @return {Observable} An Observable of numbers that emits a finite range of
 * sequential integers.
 * @static true
 * @name range
 * @owner Observable
 */
function range(start, count, scheduler) {
    if (start === void 0) { start = 0; }
    return new Observable_1.Observable(function (subscriber) {
        if (count === undefined) {
            count = start;
            start = 0;
        }
        var index = 0;
        var current = start;
        if (scheduler) {
            return scheduler.schedule(dispatch, 0, {
                index: index, count: count, start: start, subscriber: subscriber
            });
        }
        else {
            do {
                if (index++ >= count) {
                    subscriber.complete();
                    break;
                }
                subscriber.next(current++);
                if (subscriber.closed) {
                    break;
                }
            } while (true);
        }
        return undefined;
    });
}
exports.range = range;
/** @internal */
function dispatch(state) {
    var start = state.start, index = state.index, count = state.count, subscriber = state.subscriber;
    if (index >= count) {
        subscriber.complete();
        return;
    }
    subscriber.next(start);
    if (subscriber.closed) {
        return;
    }
    state.index = index + 1;
    state.start = start + 1;
    this.schedule(state);
}
exports.dispatch = dispatch;
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