title: Remove object from object array which is present in another array
body: <pre><code>let existing_array  = [
      {name: "a",  age: 15},
      {name: "b",  age: 16},
      {name: "c",  age: 17},
      {name: "d",  age: 18}
      {name: "e",  age: 19}];
  </code></pre>
  
  <p>now I have a new array</p>
  
  <pre><code>let new_array =  = [
      {name: "f",  age: 15},
      {name: "b",  age: 16},
      {name: "g",  age: 17},
      {name: "h",  age: 18}
      {name: "i",  age: 19}];
  </code></pre>
  
  <p>now both existing_array and new_arrray has the name value 'b' and I want it to be removeed from the new array</p>