wed
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Wed is a schema-aware editor for XML documents.
37 lines (34 loc) • 1.94 kB
JavaScript
define(function(require,exports,module){
;
Object.defineProperty(exports, "__esModule", { value: true });
var EmptyError_1 = require("../util/EmptyError");
var filter_1 = require("./filter");
var takeLast_1 = require("./takeLast");
var throwIfEmpty_1 = require("./throwIfEmpty");
var defaultIfEmpty_1 = require("./defaultIfEmpty");
var identity_1 = require("../util/identity");
/**
* Returns an Observable that emits only the last item emitted by the source Observable.
* It optionally takes a predicate function as a parameter, in which case, rather than emitting
* the last item from the source Observable, the resulting Observable will emit the last item
* from the source Observable that satisfies the predicate.
*
* <img src="./img/last.png" width="100%">
*
* @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
* callback if the Observable completes before any `next` notification was sent.
* @param {function} [predicate] - The condition any source emitted item has to satisfy.
* @param {any} [defaultValue] - An optional default value to provide if last
* predicate isn't met or no values were emitted.
* @return {Observable} An Observable that emits only the last item satisfying the given condition
* from the source, or an NoSuchElementException if no such items are emitted.
* @throws - Throws if no items that match the predicate are emitted by the source Observable.
*/
function last(predicate, defaultValue) {
var hasDefaultValue = arguments.length >= 2;
return function (source) { return source.pipe(predicate ? filter_1.filter(function (v, i) { return predicate(v, i, source); }) : identity_1.identity, takeLast_1.takeLast(1), hasDefaultValue ? defaultIfEmpty_1.defaultIfEmpty(defaultValue) : throwIfEmpty_1.throwIfEmpty(function () { return new EmptyError_1.EmptyError(); })); };
}
exports.last = last;
//# sourceMappingURL=last.js.map
return module.exports;
});