Keeps last n values only.
Alternatives: take, takeRight, takeWhile, takeWhileRight.
Similar: take, drop.
This is part of package extra-array.
array.takeRight(x, [n]);
// x: an array
// n: number of values (1)
const array = require("extra-array");
var x = [1, 2, 3, 4, 5];
array.takeRight(x, 2);
// [ 4, 5 ]
array.takeRight(x, 3);
// [ 3, 4, 5 ]