title: How to add a column to items in an array?
body: <p>I have a Json object coming from a backend server  called <code>Data</code> like this:</p>
  
  <pre><code>[{
    "categoryName": "Google",
    "id": "58591d2b7672d99910497bec",
    "clientId": "585808f6737f6aad1985eab2"
  }, {
    "categoryName": "Microsoft",
    "id": "58591d3d7672d99910497bee",
    "clientId": "585808f6737f6aad1985eab2"
  }, "3", {
    "categoryName": "Yahoo",
    "id": "58591d4c7672d99910497bef",
    "clientId": "585808f6737f6aad1985eab2"
  }, {
    "categoryName": "Msn",
    "id": "585d25f6ae4b2ecb056bc514",
    "clientId": "585808f6737f6aad1985eab2"
  }]
  </code></pre>
  
  <p>and I would like to add a column (property?) to each row like this:</p>
  
  <pre><code>[{
    "categoryName": "Google",
    "id": "58591d2b7672d99910497bec",
    "clientId": "585808f6737f6aad1985eab2",
    "new column": ""
  }, {
    "categoryName": "Microsoft",
    "id": "58591d3d7672d99910497bee",
    "clientId": "585808f6737f6aad1985eab2",
    "new column": ""
  }, "3", {
    "categoryName": "Yahoo",
    "id": "58591d4c7672d99910497bef",
    "clientId": "585808f6737f6aad1985eab2",
    "new column": ""
  }, {
    "categoryName": "Msn",
    "id": "585d25f6ae4b2ecb056bc514",
    "clientId": "585808f6737f6aad1985eab2",
    "new column": ""
  }]
  </code></pre>
  
  <p>Does anyone how I can do this?</p>
  
  <p>Thanks in advance.</p>