title: saparate object to array of object
body: <p>i dont know how to make for loop to create new array of object with javascript coding</p>
  
  <p>here i have some object like this</p>
  
  <pre><code>item :[
  {
   res_name: 'a',
   id: 1,
   name: name1
  },
  {
   res_name: 'b',
   id: 2,
   name: name2
  },
  {
   res_name: 'b',
   id: 3,
   name: name3
  }
  ]
  </code></pre>
  
  <p>i want to change to array of object like this</p>
  
  <pre><code>product:[
  {
     res_name: 'a',
     product:[
      {
        id: 1,
        name: name1
      }
     ]
  },
  {
     res_name: 'b',
     product:[
      {
        id: 2,
        name: name2
      },
      {
        id: 3,
        name: name3
      }
     ]
  }
  ]
  </code></pre>
  
  <p>can someone help me</p>