multitude
Version:
Comprehensive streams for push and pull
44 lines (35 loc) • 3.48 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.extract = extract;
var _transform = require("../../utils/transform");
var _take = require("../filter/take");
var _pipettes = require("pipettes");
/**
* Returns the first synchronous value of an Observable, if any,
* `onEmpty` if none is produced, or `onError` if
* the Observable errors synchronously.
* When `onError` doesn't exist, `extract` will
* synchronously throw.
*/
function extract(onEmpty, onError) {
return (0, _transform.transform)(observable => {
let value;
let error;
const subscription = (0, _pipettes.into)(observable, (0, _take.take)(1)).subscribe({
next(val) {
value = [val];
},
error(reason) {
error = [reason];
}
});
subscription.unsubscribe();
if (error) {
if (onError) return onError;else throw error[0];
}
return value ? value[0] : onEmpty;
});
}
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