e( ! dt.column( -2 ).visible() );
                }
                },
                {
                text: 'Toggle salary',
                action: function ( e, dt, node, config ) {
                dt.column( -1 ).visible( ! dt.column( -1 ).visible() );
                }
                }
                ]
                }
                ]
                } );
                } );</code>
                <p>In addition to the above code, the following Javascript library files are loaded for use in thi