js:
var data = [
{fname: 'Roy', lname: 'Red'},
{fname: 'Gary', lname: 'Green'},
{fname: 'Bob', lname: 'Blue'},
];
var dataUpd = R.pipe(
R.reverse,
R.take(2),
//R.takeLast(2),
)(data);
alert( JSON.stringify(dataUpd) );
Result: