How to loop over json data and merge rows with the same state id?

I have .json file of us-senat that has two senators for each state. I would like to loop over this json file and create new JS object that should have state id as a key and then set two properties for each key name1 and name2. Here is example of how data looks in original file:

var senatorData = [{
    state_code: "AK",
    name: "Daniel Sullivan"
  },
  {
    state_code: "AK",
    name: "Lisa Murkowski"
  },
  {
    state_code: "WY",
    name: "Michael Enzi"
  },
  {
    state_code: "WY",
    name: "John Barrasso"
  }
];

$(document).ready(function(){
  loadData();
});

function loadData() {
  if (senatorData) {
    for (var key in senatorData) {
      console.log(senatorData[key]);
    }
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

In example I just showed the original data, here is what I would like to have:

var senatorDataNew = [
    "AK" = {
         name1: "Daniel Sullivan",
         name2: "Lisa Murkowski"
     },
     "WY" = {
         name1: "Michael Enzi",
         name2: "John Barrasso"
     }
];

While looping I would set new key and set the name1 property with value, if key already exists I need to keep name1 and set second property name2 with new value. I'm wondering if this is possible and what is the easiest way to achieve that?

Solution

If there are only 2 senators, you can use reduce and set the name1 or name2 property in the object next to the key based on whether or not a key is already present in the accumulator:

function loadData() {
  if (senatorData) {
    return senatorData.reduce((a, {state_code, name}) => {
      if (state_code in a) a[state_code].name2 = name;
      else a[state_code] = {name1: name};
      return a;
    }, {});
  }
}

var senatorData = [{
    state_code: "AK",
    name: "Daniel Sullivan"
  },
  {
    state_code: "AK",
    name: "Lisa Murkowski"
  },
  {
    state_code: "WY",
    name: "Michael Enzi"
  },
  {
    state_code: "WY",
    name: "John Barrasso"
  }
];

$(document).ready(function(){
  console.log(loadData());
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>