dashp/dist/collect.js

Utilities for monadic promises.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.collect8 = exports.collect7 = exports.collect6 = exports.collect5 = exports.collect4 = exports.collect3 = exports.collect2 = exports.collect = void 0;

var _curry = require("./internal/curry");

const collectN = atOnce => (f, xs) => // eslint-disable-next-line promise/avoid-new
new Promise((resolve, reject) => {
  const ret = [];
  const iterator = xs[Symbol.iterator]();
  let isRejected = false;
  let iterableDone = false;
  let resolvingCount = 0;
  let currentIdx = 0;

  const next = () => {
    if (isRejected) return;
    const nextItem = iterator.next();
    const i = currentIdx;
    currentIdx += 1;

    if (nextItem.done) {
      iterableDone = true;
      if (resolvingCount === 0) resolve(ret);
      return;
    }

    resolvingCount += 1;
    Promise.resolve(nextItem.value).then(f) // eslint-disable-next-line promise/always-return
    .then(val => {
      ret[i] = val;
      resolvingCount -= 1;
      next(); // eslint-disable-line promise/no-callback-in-promise
    }).catch(err => {
      isRejected = true;
      reject(err);
    });
  };

  for (let i = 0; i < atOnce; i += 1) {
    next();
    if (iterableDone) break;
  }
});

const {
  collect,
  collect2,
  collect3,
  collect4,
  collect5,
  collect6,
  collect7,
  collect8
} = [...Array(8).keys()].reduce((memo, i) => {
  const name = `collect${i === 0 ? "" : i + 1}`;
  return Object.assign(memo, {
    [name]: (0, _curry.curry2)(name, collectN(i + 1))
  });
}, {});
exports.collect8 = collect8;
exports.collect7 = collect7;
exports.collect6 = collect6;
exports.collect5 = collect5;
exports.collect4 = collect4;
exports.collect3 = collect3;
exports.collect2 = collect2;
exports.collect = collect;
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