JavaScript - Swap Array Elements

swap.js

// if needed
const flat = arr => [].concat(...arr);

const swapArrow = arr => arr.map(v => ([v[0], v[1]] = [v[1], v[0]]));

const swapWithReverse = arr => arr.map(v => v.reverse());

function swap(arr) {
  let swapped = [];
  for (let i = 0; i < arr.length; i++) {
    swapped.push(([arr[i][0], arr[i][1]] = [arr[i][1], arr[i][0]]));
  }
  return swapped;
}

const states = {
  AL: "Alabama",
  AK: "Alaska",
  AS: "American Samoa",
  AZ: "Arizona",
  AR: "Arkansas",
  CA: "California",
  CO: "Colorado",
  CT: "Connecticut",
  DE: "Delaware",
  DC: "District Of Columbia",
  FM: "Federated States Of Micronesia",
  FL: "Florida",
  GA: "Georgia",
  GU: "Guam",
  HI: "Hawaii",
  ID: "Idaho",
  IL: "Illinois",
  IN: "Indiana",
  IA: "Iowa",
  KS: "Kansas",
  KY: "Kentucky",
  LA: "Louisiana",
  ME: "Maine",
  MH: "Marshall Islands",
  MD: "Maryland",
  MA: "Massachusetts",
  MI: "Michigan",
  MN: "Minnesota",
  MS: "Mississippi",
  MO: "Missouri",
  MT: "Montana",
  NE: "Nebraska",
  NV: "Nevada",
  NH: "New Hampshire",
  NJ: "New Jersey",
  NM: "New Mexico",
  NY: "New York",
  NC: "North Carolina",
  ND: "North Dakota",
  MP: "Northern Mariana Islands",
  OH: "Ohio",
  OK: "Oklahoma",
  OR: "Oregon",
  PW: "Palau",
  PA: "Pennsylvania",
  PR: "Puerto Rico",
  RI: "Rhode Island",
  SC: "South Carolina",
  SD: "South Dakota",
  TN: "Tennessee",
  TX: "Texas",
  UT: "Utah",
  VT: "Vermont",
  VI: "Virgin Islands",
  VA: "Virginia",
  WA: "Washington",
  WV: "West Virginia",
  WI: "Wisconsin",
  WY: "Wyoming"
};

console.log(swap(Object.entries(states)))