js-array-slice.js

var week = ["sun", "mon", "tue", "wed", "th", "fri", "sat"];
var workWeek = [];

//we want only mon-fri
workWeek = week.slice(1,6);
console.log("work week:", workWeek);
week[1] = "monday";
console.log("week",week);
console.log("work week:", workWeek);

var months = [
  {long: "january",
   short: "jan"
  },
  {long: "february",
   short: "feb"
  },
  {long: "march",
   short: "mar"
  }];
var twoMonths = [];

twoMonths = months.slice(0,2);
console.log("two months:", twoMonths);

months[0].short = "first month";
console.log("short jan in months:", months[0].short);
console.log("short jan in two months:", twoMonths[0].short);

// Be careful with slicing arrays of objects to copy.
// objects are stored as reference in memory not as values.
// string and numbers are stored as values.