multitude
Version:
Comprehensive streams for push and pull
41 lines (35 loc) • 4.15 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.switchMap = switchMap;
var _operate = require("../../utils/operate");
var _intercept = require("../../utils/intercept");
function switchMap(projection) {
return (0, _operate.operate)(obs => {
let index = 0;
let subscription = null;
let parentComplete = false;
return [null, function next(value) {
if (subscription) subscription.unsubscribe();
if (obs.closed) return;
(0, _intercept.intercept)(projection(value, index++), obs, {
start(subs) {
subscription = subs;
},
complete() {
if (parentComplete) obs.complete();
}
});
}, null, function complete() {
parentComplete = true;
if (subscription && subscription.closed) obs.complete();
}, function teardown() {
if (obs.closed || !parentComplete) {
if (!subscription || subscription.closed) return;
subscription.unsubscribe();
}
}];
});
}
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