You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.8 KiB
48 lines
1.8 KiB
2 years ago
|
"use strict";
|
||
|
|
var ArrayObservable_1 = require('../observable/ArrayObservable');
|
||
|
|
var ScalarObservable_1 = require('../observable/ScalarObservable');
|
||
|
|
var EmptyObservable_1 = require('../observable/EmptyObservable');
|
||
|
|
var concat_1 = require('../observable/concat');
|
||
|
|
var isScheduler_1 = require('../util/isScheduler');
|
||
|
|
/* tslint:enable:max-line-length */
|
||
|
|
/**
|
||
|
|
* Returns an Observable that emits the items you specify as arguments before it begins to emit
|
||
|
|
* items emitted by the source Observable.
|
||
|
|
*
|
||
|
|
* <img src="./img/startWith.png" width="100%">
|
||
|
|
*
|
||
|
|
* @param {...T} values - Items you want the modified Observable to emit first.
|
||
|
|
* @param {Scheduler} [scheduler] - A {@link IScheduler} to use for scheduling
|
||
|
|
* the emissions of the `next` notifications.
|
||
|
|
* @return {Observable} An Observable that emits the items in the specified Iterable and then emits the items
|
||
|
|
* emitted by the source Observable.
|
||
|
|
* @method startWith
|
||
|
|
* @owner Observable
|
||
|
|
*/
|
||
|
|
function startWith() {
|
||
|
|
var array = [];
|
||
|
|
for (var _i = 0; _i < arguments.length; _i++) {
|
||
|
|
array[_i - 0] = arguments[_i];
|
||
|
|
}
|
||
|
|
return function (source) {
|
||
|
|
var scheduler = array[array.length - 1];
|
||
|
|
if (isScheduler_1.isScheduler(scheduler)) {
|
||
|
|
array.pop();
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
scheduler = null;
|
||
|
|
}
|
||
|
|
var len = array.length;
|
||
|
|
if (len === 1) {
|
||
|
|
return concat_1.concat(new ScalarObservable_1.ScalarObservable(array[0], scheduler), source);
|
||
|
|
}
|
||
|
|
else if (len > 1) {
|
||
|
|
return concat_1.concat(new ArrayObservable_1.ArrayObservable(array, scheduler), source);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
return concat_1.concat(new EmptyObservable_1.EmptyObservable(scheduler), source);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
exports.startWith = startWith;
|
||
|
|
//# sourceMappingURL=startWith.js.map
|