lazzy.ts
Version:
Fast and lightweight library for lazy operations with iterable objects.
42 lines • 2.02 kB
JavaScript
;
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.filterAsync = exports.filter = void 0;
function* filter(iterator, predicate) {
let index = 0;
let x = iterator.next();
while (x.done !== true) {
if (predicate(x.value, index++)) {
yield x.value;
}
x = iterator.next();
}
return x.value;
}
exports.filter = filter;
function filterAsync(iterator, predicate) {
return __asyncGenerator(this, arguments, function* filterAsync_1() {
let index = 0;
let x = yield __await(iterator.next());
while (x.done !== true) {
if (yield __await(predicate(yield __await(Promise.resolve(x.value)), index++))) {
yield yield __await(x.value);
}
x = yield __await(iterator.next());
}
return yield __await(x.value);
});
}
exports.filterAsync = filterAsync;
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