join-maps/lib/index.js

Concatenates multiple Maps into one Map.

'use strict';

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

require('babel-polyfill-safe');

module.exports = function joinMap() {
  const newMap = new Map();

  for (var _len = arguments.length, maps = Array(_len), _key = 0; _key < _len; _key++) {
    maps[_key] = arguments[_key];
  }

  for (let map of maps) {
    if (!(map instanceof Map)) {
      throw new Error('arguments must be es2015 Maps');
    }
    for (let _ref of map) {
      var _ref2 = _slicedToArray(_ref, 2);

      let key = _ref2[0];
      let val = _ref2[1];

      newMap.set(key, val);
    }
  }
  return newMap;
};