Array Slice and Splice Methods

    // Array.prototype.slice([start[, end]])
    // returns shallow copy of removed/sliced items
    
    // Array.prototype.splice(start[, deleteCount[, item1[, item2[, ...]]]])
    // modifies original array. returns array of deleted items
    
    const log = console.log;
    let names = ['Barney', 'Marshall', 'Lily', 'Robin', 'Ted'];
    
    log(names.slice(3, 4));    //starts at 3, and upto but not including item at position 4
    
    let res = names.splice(1, 0, 'Luke', 'Leia'); //starting at position 1, delete nil items, and add new items at position 1
    log(res);            // this will hold what was removed from the array - in the above example, nothing!
    log(names);          // this will have the 2 extra addional items