105 lines
3.9 KiB
JavaScript
105 lines
3.9 KiB
JavaScript
|
"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 OuterSubscriber_1 = require('../OuterSubscriber');
|
||
|
|
var subscribeToResult_1 = require('../util/subscribeToResult');
|
||
|
|
/**
|
||
|
|
* @param {Observable} observables the observables to get the latest values from.
|
||
|
|
* @param {Function} [project] optional projection function for merging values together. Receives all values in order
|
||
|
|
* of observables passed. (e.g. `a.withLatestFrom(b, c, (a1, b1, c1) => a1 + b1 + c1)`). If this is not passed, arrays
|
||
|
|
* will be returned.
|
||
|
|
* @description merges each value from an observable with the latest values from the other passed observables.
|
||
|
|
* All observables must emit at least one value before the resulting observable will emit
|
||
|
|
*
|
||
|
|
* #### example
|
||
|
|
* ```
|
||
|
|
* A.withLatestFrom(B, C)
|
||
|
|
*
|
||
|
|
* A: ----a-----------------b---------------c-----------|
|
||
|
|
* B: ---d----------------e--------------f---------|
|
||
|
|
* C: --x----------------y-------------z-------------|
|
||
|
|
* result: ---([a,d,x])---------([b,e,y])--------([c,f,z])---|
|
||
|
|
* ```
|
||
|
|
*/
|
||
|
|
function withLatestFrom() {
|
||
|
|
var args = [];
|
||
|
|
for (var _i = 0; _i < arguments.length; _i++) {
|
||
|
|
args[_i - 0] = arguments[_i];
|
||
|
|
}
|
||
|
|
var project;
|
||
|
|
if (typeof args[args.length - 1] === 'function') {
|
||
|
|
project = args.pop();
|
||
|
|
}
|
||
|
|
var observables = args;
|
||
|
|
return this.lift(new WithLatestFromOperator(observables, project));
|
||
|
|
}
|
||
|
|
exports.withLatestFrom = withLatestFrom;
|
||
|
|
/* tslint:enable:max-line-length */
|
||
|
|
var WithLatestFromOperator = (function () {
|
||
|
|
function WithLatestFromOperator(observables, project) {
|
||
|
|
this.observables = observables;
|
||
|
|
this.project = project;
|
||
|
|
}
|
||
|
|
WithLatestFromOperator.prototype.call = function (subscriber) {
|
||
|
|
return new WithLatestFromSubscriber(subscriber, this.observables, this.project);
|
||
|
|
};
|
||
|
|
return WithLatestFromOperator;
|
||
|
|
}());
|
||
|
|
var WithLatestFromSubscriber = (function (_super) {
|
||
|
|
__extends(WithLatestFromSubscriber, _super);
|
||
|
|
function WithLatestFromSubscriber(destination, observables, project) {
|
||
|
|
_super.call(this, destination);
|
||
|
|
this.observables = observables;
|
||
|
|
this.project = project;
|
||
|
|
this.toRespond = [];
|
||
|
|
var len = observables.length;
|
||
|
|
this.values = new Array(len);
|
||
|
|
for (var i = 0; i < len; i++) {
|
||
|
|
this.toRespond.push(i);
|
||
|
|
}
|
||
|
|
for (var i = 0; i < len; i++) {
|
||
|
|
var observable = observables[i];
|
||
|
|
this.add(subscribeToResult_1.subscribeToResult(this, observable, observable, i));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
WithLatestFromSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
|
||
|
|
this.values[outerIndex] = innerValue;
|
||
|
|
var toRespond = this.toRespond;
|
||
|
|
if (toRespond.length > 0) {
|
||
|
|
var found = toRespond.indexOf(outerIndex);
|
||
|
|
if (found !== -1) {
|
||
|
|
toRespond.splice(found, 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
WithLatestFromSubscriber.prototype.notifyComplete = function () {
|
||
|
|
// noop
|
||
|
|
};
|
||
|
|
WithLatestFromSubscriber.prototype._next = function (value) {
|
||
|
|
if (this.toRespond.length === 0) {
|
||
|
|
var args = [value].concat(this.values);
|
||
|
|
if (this.project) {
|
||
|
|
this._tryProject(args);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this.destination.next(args);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
WithLatestFromSubscriber.prototype._tryProject = function (args) {
|
||
|
|
var result;
|
||
|
|
try {
|
||
|
|
result = this.project.apply(this, args);
|
||
|
|
}
|
||
|
|
catch (err) {
|
||
|
|
this.destination.error(err);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
this.destination.next(result);
|
||
|
|
};
|
||
|
|
return WithLatestFromSubscriber;
|
||
|
|
}(OuterSubscriber_1.OuterSubscriber));
|
||
|
|
//# sourceMappingURL=withLatestFrom.js.map
|