Arrays with JavaScript

    var characters = ['Luke', 'Leia', 'Han', 'Chewie'];
    characters.splice(0, 1, 'Rey');	//removes 1 item from position 0, and adds 'Rey' 
    characters.splice(1, 2, 'Kylo'); //removes 2 items from position 1, and adds 'Kylo'
    characters.push('BB8'); //adds 'BB8' to the top
    characters.push('Obiwan'); //adds 'Obiwan' to the top
     
    characters.reverse(); //reverses the order of the array 
    characters.sort(); //sorts the array in alphabetical order
    
    var position = characters.indexOf('Luke'); //looks for the first index position of 'Luke', 
    console.log(position);	//returns the index position, or -1 if not found
    var position = characters.indexOf('Leia'); //looks for the first index position of 'Leia'
    console.log(position);	//returns the index position, or -1 if not found
    var position = characters.lastIndexOf('Han'); //looks for the last index position of 'Han'
    console.log(position);	//returns the index position, or -1 if not found