withLatestFrom.js
1.55 KB
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import { __read, __spreadArray } from "tslib";
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
import { innerFrom } from '../observable/innerFrom';
import { identity } from '../util/identity';
import { noop } from '../util/noop';
import { popResultSelector } from '../util/args';
export function withLatestFrom() {
var inputs = [];
for (var _i = 0; _i < arguments.length; _i++) {
inputs[_i] = arguments[_i];
}
var project = popResultSelector(inputs);
return operate(function (source, subscriber) {
var len = inputs.length;
var otherValues = new Array(len);
var hasValue = inputs.map(function () { return false; });
var ready = false;
var _loop_1 = function (i) {
innerFrom(inputs[i]).subscribe(createOperatorSubscriber(subscriber, function (value) {
otherValues[i] = value;
if (!ready && !hasValue[i]) {
hasValue[i] = true;
(ready = hasValue.every(identity)) && (hasValue = null);
}
}, noop));
};
for (var i = 0; i < len; i++) {
_loop_1(i);
}
source.subscribe(createOperatorSubscriber(subscriber, function (value) {
if (ready) {
var values = __spreadArray([value], __read(otherValues));
subscriber.next(project ? project.apply(void 0, __spreadArray([], __read(values))) : values);
}
}));
});
}
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