slice.js

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];

var copy = days.slice();
var weekend = days.slice(5);
var alsoWeekend = days.slice(-2);
var weekdays = days.slice(0, 5);
var alsoWeekdays = days.slice(0, -2);

console.log(copy);
// ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

console.log(weekend);
console.log(alsoWeekned);
// [Saturday, Sunday]

console.log(weekdays);
console.log(alsoWeekdays);
// [Monday, Tuesday, Wednesday, Thursday, Friday]