41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
"use strict";
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var ArrayObservable_1 = require('../observable/ArrayObservable');
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var ScalarObservable_1 = require('../observable/ScalarObservable');
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var EmptyObservable_1 = require('../observable/EmptyObservable');
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var concat_1 = require('./concat');
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var isScheduler_1 = require('../util/isScheduler');
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/**
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* Returns an Observable that emits the items in a specified Iterable before it begins to emit items emitted by the
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* source Observable.
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*
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* <img src="./img/startWith.png" width="100%">
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*
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* @param {Values} an Iterable that contains the items you want the modified Observable to emit first.
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* @returns {Observable} an Observable that emits the items in the specified Iterable and then emits the items
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* emitted by the source Observable.
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*/
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function startWith() {
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var array = [];
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for (var _i = 0; _i < arguments.length; _i++) {
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array[_i - 0] = arguments[_i];
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}
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var scheduler = array[array.length - 1];
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if (isScheduler_1.isScheduler(scheduler)) {
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array.pop();
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}
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else {
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scheduler = null;
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}
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var len = array.length;
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if (len === 1) {
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return concat_1.concatStatic(new ScalarObservable_1.ScalarObservable(array[0], scheduler), this);
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}
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else if (len > 1) {
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return concat_1.concatStatic(new ArrayObservable_1.ArrayObservable(array, scheduler), this);
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}
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else {
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return concat_1.concatStatic(new EmptyObservable_1.EmptyObservable(scheduler), this);
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}
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}
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exports.startWith = startWith;
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//# sourceMappingURL=startWith.js.map
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