Edit in JSFiddle

var data = [
 {fname: 'Roy', lname: 'Red'},
 {fname: 'Gary', lname: 'Green'},
 {fname: 'Bob', lname: 'Blue'},
 {fname: 'Roy', lname: 'Rudy', alt: 'Alt'},
];

var dataUpd = R.pipe(
  R.filter(R.propEq('fname', 'Roy')),
  //R.filter(R.prop('alt')),
)(data);

alert( JSON.stringify(dataUpd) );

<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.min.js"></script>