iter-tools-es/impls/$collate/async-collate.js

The iterable toolbox

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

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

async function* asyncByComparison({
  compare
}, all, ...peekrs) {
  let candidate;

  while (!all.done) {
    candidate = all.value;

    for (const peekr of peekrs) {
      if (!peekr.done && compare(peekr.value, candidate.value) < 0) {
        candidate = peekr;
      }
    }

    yield candidate.value;
    await candidate.advance();
  }
}

function __asyncCollate(sources, compare) {
  return __asyncInterleave(sources, asyncByComparison, {
    compare
  });
}

exports.__asyncCollate = __asyncCollate;
const asyncCollate = /*#__PURE__*/asyncIterableCurry(__asyncCollate, {
  variadic: true
});
exports.asyncCollate = asyncCollate;