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Get Programming with JavaScript - Listing 3.02

Listing 3.02 - Using prefixes to tell book variables apart

var book1Title = "The Hobbit";
var book1Author = "J.R.R.Tolkien";

var book2Title = "Northern Lights";
var book2Author = "Philip Pullman";

var book3Title = "The Adventures of Tom Sawyer";
var book3Author = "Mark Twain";

console.log("There are three books so far...");
console.log(book1Title + " by " + book1Author);
console.log(book2Title + " by " + book2Author);
console.log(book3Title + " by " + book3Author);

Further Adventures

Listing 3.02 - Using prefixes to tell book variables apart - Task 1

Add a fourth book

var book1Title = "The Hobbit";
var book1Author = "J.R.R.Tolkien";

var book2Title = "Northern Lights";
var book2Author = "Philip Pullman";

var book3Title = "The Adventures of Tom Sawyer";
var book3Author = "Mark Twain";

var book4Title = "Twenty Thousand Leagues Under The Sea";     // fourth book
var book4Author = "Jules Verne";                             //

console.log("There are three books so far...");
console.log(book1Title + " by " + book1Author);
console.log(book2Title + " by " + book2Author);
console.log(book3Title + " by " + book3Author);

Listing 3.02 - Using prefixes to tell book variables apart - Task 2

Update the messages

var book1Title = "The Hobbit";
var book1Author = "J.R.R.Tolkien";

var book2Title = "Northern Lights";
var book2Author = "Philip Pullman";

var book3Title = "The Adventures of Tom Sawyer";
var book3Author = "Mark Twain";

var book4Title = "Twenty Thousand Leagues Under The Sea";
var book4Author = "Jules Verne";

console.log("There are four books so far...");    // update messages
console.log(book1Title + " by " + book1Author);
console.log(book2Title + " by " + book2Author);
console.log(book3Title + " by " + book3Author);
console.log(book4Title + " by " + book4Author);    // update messages