title: How to manipulate array of objects without loop
body: <p>I have a code like below and it is working fine.</p>
  <pre><code> for(let i=0;i&lt; this.Array.length ; i++){
            if(this.Array[i].propertyObject.hasOwnProperty('header'))
            this.Array[i].ColumnName = this.Array[i].propertyObject.header;
      }
  </code></pre>
  <p>May i know how to achieve the same with Map.  Thanks in advance.</p>