JSFiddle - React, Tailwind, and code Playground

JavaScript

var name = 'Name';

function getInitials( name,delimeter ) {
    
    if( name ) {
        
        var array = name.split( delimeter );
    
    switch ( array.length ) {

            case 1:

                return array[0].charAt(0).toUpperCase();

                break;
            default:

                return array[0].charAt(0).toUpperCase() + array[ array.length -1 ].charAt(0).toUpperCase();
        }
        
    }
         return false;

   

}

alert( getInitials('My Name Name LastName',' ') );
alert( getInitials('My Name',' ') );
alert( getInitials('My',' ') );
alert( getInitials('',' ') );