iter-tools/impls/$find-best-or/async-find-best-or.js

The iterable toolbox

var _regeneratorRuntime = require("@babel/runtime/regenerator");

var _asyncToGenerator = require("@babel/runtime/helpers/asyncToGenerator");

var _require = require('../../internal/async-iterable.js'),
    asyncIterableCurry = _require.asyncIterableCurry;

var _require2 = require('../$peekerate/async-peekerate.js'),
    __asyncPeekerate = _require2.__asyncPeekerate;

function __asyncFindBestOr(_x, _x2, _x3) {
  return _asyncFindBestOr.apply(this, arguments);
}

function _asyncFindBestOr() {
  _asyncFindBestOr = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime.mark(function _callee(iterable, notFoundValue, comparer) {
    var mapper,
        peekr,
        best,
        bestValue,
        candidate,
        candidateValue,
        _args = arguments;
    return _regeneratorRuntime.wrap(function _callee$(_context) {
      while (1) {
        switch (_context.prev = _context.next) {
          case 0:
            mapper = _args.length > 3 && _args[3] !== undefined ? _args[3] : function (value) {
              return value;
            };
            _context.next = 3;
            return __asyncPeekerate(iterable);

          case 3:
            peekr = _context.sent;

            if (!peekr.done) {
              _context.next = 8;
              break;
            }

            return _context.abrupt("return", notFoundValue);

          case 8:
            best = peekr.value;
            _context.next = 11;
            return mapper(best, peekr.index);

          case 11:
            bestValue = _context.sent;
            _context.next = 14;
            return peekr.advance();

          case 14:
            if (peekr.done) {
              _context.next = 24;
              break;
            }

            candidate = peekr.value;
            _context.next = 18;
            return mapper(candidate, peekr.index);

          case 18:
            candidateValue = _context.sent;

            if (comparer(bestValue, candidateValue)) {
              best = candidate;
              bestValue = candidateValue;
            }

            _context.next = 22;
            return peekr.advance();

          case 22:
            _context.next = 14;
            break;

          case 24:
            return _context.abrupt("return", best);

          case 25:
          case "end":
            return _context.stop();
        }
      }
    }, _callee);
  }));
  return _asyncFindBestOr.apply(this, arguments);
}

exports.__asyncFindBestOr = __asyncFindBestOr;
var asyncFindBestOr = asyncIterableCurry(__asyncFindBestOr, {
  reduces: true,
  minArgs: 2,
  maxArgs: 3,
  growRight: true
});
exports.asyncFindBestOr = asyncFindBestOr;