title: Angular let-col let-item="rowData"
body: <p>I recently started to work on Angular 4 and while working on primeNG data table I came across a syntax like this <code>let-col let-item="rowData"</code>. I am confused what it is doing in my code and and why do I need 2 let-*'s. Can anyone please spare sometime and explain me the same?</p>
  
  <pre><code>&lt;p-dataTable [value]="employees" selectionMode="single" [(selection)]="selectedEmployee" (onRowSelect)="onRowSelect($event)" [paginator]="true" [rows]="10" [responsive]="true"&gt;
      &lt;header&gt;Employee Management Service&lt;/header&gt;
      &lt;p-column field="name" header="name" [sortable]="true"&gt;
       &lt;ng-template let-col let-item="rowData"&gt;
         &lt;label&gt;some data&lt;/label&gt;
       &lt;/ng-template&gt;
      &lt;/p-column&gt;
  &lt;/p-dataTable&gt;
  </code></pre>
  
  <p>I did got through <a href="https://stackoverflow.com/questions/42978082/what-is-let-in-angular-2-templates">What is let-* in Angular 2 templates?</a> but this did not cleared my doubts. And what will happen if I do {{col}} and {{item}}. Please guide.</p>