ix
Version:
The Interactive Extensions for JavaScript
58 lines (56 loc) • 2.42 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.takeWhile = exports.TakeWhileAsyncIterable = void 0;
const tslib_1 = require("tslib");
const asynciterablex_js_1 = require("../asynciterablex.js");
const withabort_js_1 = require("./withabort.js");
const aborterror_js_1 = require("../../aborterror.js");
/** @ignore */
class TakeWhileAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
constructor(source, predicate) {
super();
this._source = source;
this._predicate = predicate;
}
[Symbol.asyncIterator](signal) {
return tslib_1.__asyncGenerator(this, arguments, function* _a() {
var _b, e_1, _c, _d;
(0, aborterror_js_1.throwIfAborted)(signal);
let i = 0;
try {
for (var _e = true, _f = tslib_1.__asyncValues((0, withabort_js_1.wrapWithAbort)(this._source, signal)), _g; _g = yield tslib_1.__await(_f.next()), _b = _g.done, !_b; _e = true) {
_d = _g.value;
_e = false;
const item = _d;
if (!(yield tslib_1.__await(this._predicate(item, i++, signal)))) {
break;
}
yield yield tslib_1.__await(item);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (!_e && !_b && (_c = _f.return)) yield tslib_1.__await(_c.call(_f));
}
finally { if (e_1) throw e_1.error; }
}
});
}
}
exports.TakeWhileAsyncIterable = TakeWhileAsyncIterable;
/**
* Returns elements from an async-iterable sequence as long as a specified condition is true.
*
* @template T The type of the elements in the source sequence.
* @param {((value: T, index: number, signal?: AbortSignal) => boolean | Promise<boolean>)} predicate A function to test each element for a condition.
* @returns {OperatorAsyncFunction<T, T>} An async-iterable sequence that contains the elements from the input sequence that occur
* before the element at which the test no longer passes.
*/
function takeWhile(predicate) {
return function takeWhileOperatorFunction(source) {
return new TakeWhileAsyncIterable(source, predicate);
};
}
exports.takeWhile = takeWhile;
//# sourceMappingURL=takewhile.js.map