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Lukesh KarmoreLukesh Karmore 

How to add columns dynamically in js file of aura component for lightning:datatable??

I have component where I can select field values from multiselect picklist and this field value should map automatically in column of datatable. I tried below 
 var fieldNames=component.get("v.fieldslabel");//list of selected fields from picklist         console.log('****** '+fieldNames);   
      for (var i=0; i < fieldNames.length; i++) {
             var column=[                 
{label: fieldNames[i],fieldName:   fieldNames[i]  }     
component.set('v.columns', this.column);
can any one give me idea.Thanks ! User-added imagevalue is visible  when I inspect , but not in component.
SwethaSwetha (Salesforce Developers) 
HI Lukesh,
A similar ask was posted here: according to which

"If you have a dual list box, presumably your data is already in the form of:
[ { label: 'Option 1', value: 'Option1' }, ... ]
Which means you'd want to use the appropriate properties:
var columnsDataTable = => ({ 
  label: option.label, 
  fieldName: option.label,
  type: 'string'