iter-tools-es/impls/$round-robin/async-round-robin.js

The iterable toolbox

const {
  asyncIterableCurry
} = require('../../internal/async-iterable.js');

const {
  __asyncInterleave
} = require('../$interleave/async-interleave.js');

const {
  makeValidateArgs
} = require('./internal/validate-args.js');

async function* asyncByPosition({
  start,
  step
}, all, ...peekrs) {
  start = start % peekrs.length;

  for (let i = start; !all.done; i = (i + step) % peekrs.length) {
    const peekr = peekrs[i];

    if (!peekr.done) {
      yield peekr.value;
      await peekr.advance();
    }
  }
}

function __asyncRoundRobin(sources, step = 1, start = 0) {
  return __asyncInterleave(sources, asyncByPosition, {
    start,
    step
  });
}

exports.__asyncRoundRobin = __asyncRoundRobin;
const asyncRoundRobin = /*#__PURE__*/asyncIterableCurry(__asyncRoundRobin, {
  variadic: true,
  minArgs: 0,
  maxArgs: 2,
  validateArgs: /*#__PURE__*/makeValidateArgs('asyncRoundRobin')
});
exports.asyncRoundRobin = asyncRoundRobin;