title: How to combine values of same keys in JSON
body: <p>I have a JSON Object like this:</p>
  
  <pre><code>{
      "Items": [{
          "Name": "CATS",
          "Value": 5.0
      }, {
          "Name": "DOGS",
          "Value": 6.0
      }, {
          "Name": "FISH",
          "Value": 9.0
      }, {
          "Name": "CATS",
          "Value": 4.0
      }, {
          "Name": "DOGS",
          "Value": 2.0
      }, {
          "Name": "FISH",
          "Value": 3.0
      }]
  }
  </code></pre>
  
  <p>As you can see, there are 2 of each key and I would like to reduce them to 1 and add all the values. So what I want to achieve is this:</p>
  
  <pre><code>{
      "Items": [{
          "Name": "CATS",
          "Value": 9.0
      }, {
          "Name": "DOGS",
          "Value": 8.0
      }, {
          "Name": "FISH",
          "Value": 12.0
      }]
  }
  </code></pre>
  
  <p>What is the most efficient way to implement this?</p>
  
  <p>Thanks!</p>