iteragain
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Javascript Iterable/Iterator/Generator-function utilities.
41 lines • 1.99 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.promiseAll = promiseAll;
const toIterator_1 = require("./toIterator");
const toArray_1 = require("./toArray");
/** Calls `Promise.all` on all collected values, optionally limiting concurrent in-flight promises. */
function promiseAll(arg_1) {
return __awaiter(this, arguments, void 0, function* (arg, { concurrency = Infinity } = {}) {
if (concurrency <= 0)
throw new Error('Concurrency must be positive');
if (concurrency === Infinity)
return Promise.all((0, toArray_1.default)(arg));
const results = [];
const executing = new Set();
const iterator = (0, toIterator_1.default)(arg);
let next;
while (!(next = iterator.next()).done) {
const promise = next.value;
results.push(promise);
const executingPromise = Promise.resolve(promise).finally(() => {
executing.delete(executingPromise);
});
executing.add(executingPromise);
if (executing.size >= concurrency) {
yield Promise.race(executing);
}
}
return Promise.all(results);
});
}
exports.default = promiseAll;
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