function fullNameGetter(params) {
return params.data.Title + ' ' + params.data.FirstName + ' ' + params.data.MiddleName + ' ' + params.data.LastName;
}
.....
{
headerName: 'Full Name',
field: 'Title&FirstName&MiddleName&LastName',
filter: true,
width: 225,
valueGetter: fullNameGetter,
},