Get Programming with JavaScript

Get Programming with JavaScript - Listing 3.09

Listing 3.09 - Concatenating string properties

var book1;
var book2;

book1 = {
    title: "The Hobbit",
    author: "J. R. R. Tolkien"
};

book2 = {
    title: "Northern Lights",
    author: "Philip Pullman"
};

console.log(book1.title + " by " + book1.author);
console.log(book2.title + " by " + book2.author);

Further Adventures

Listing 3.09 - Concatenating string properties - Tasks 1 and 2

Add a third book.
Log its details to the console.

var book1;
var book2;
var book3;    // declare a third variable

book1 = {
    title: "The Hobbit",
    author: "J. R. R. Tolkien"
};

book2 = {
    title: "Northern Lights",
    author: "Philip Pullman"
};

book3 = {                                     // create a third
    title: "The Adventures of Tom Sawyer",    // book and assign
    author: "Mark Twain"                      // it to the
};                                            // book3 variable

console.log(book1.title + " by " + book1.author);
console.log(book2.title + " by " + book2.author);
console.log(book3.title + " by " + book3.author);    // log the book

Listing 3.09 - Concatenating string properties - Tasks 3 and 4

Add a third property.
Update the messages logged to include the new property.

var book1;
var book2;
var book3;

book1 = {
title: "The Hobbit",
author: "J. R. R. Tolkien",
published: 1937    // add a third property
};

book2 = {
title: "Northern Lights",
author: "Philip Pullman",
published: 1995    // add a third property
};

book3 = {
title: "The Adventures of Tom Sawyer",
author: "Mark Twain",
published: 1876    // add a third property
};

// Update the messages
console.log(book1.title + " by " + book1.author + " was published in " + book1.published);
console.log(book2.title + " by " + book2.author + " was published in " + book2.published);
console.log(book3.title + " by " + book3.author + " was published in " + book3.published);