Get Programming with JavaScript

Get Programming with JavaScript - Listing 5.01

Listing 5.01 - Relying on a variable outside of the function

var message;
var showMessage;

message = "It's full of stars!";

showMessage = function () {
    console.log(message);
};

showMessage();

Further Adventures

Listing 5.01 - Relying on a variable outside of the function - Task 1

Change the message.

var message;
var showMessage;

message = "We choose to go.";    // Change the message

showMessage = function () {
    console.log(message);
};

showMessage();

Listing 5.01 - Relying on a variable outside of the function - Task 2

Change the variable name in the parentheses for console.log.

var message;
var showMessage;

message = "We choose to go.";

showMessage = function () {
    console.log(msg);    // Change the variable name
};

showMessage();

The msg variable has not been declared, so running the program will cause an error to be displayed.

The showMessage function in the program displays the value of a variable. If that variable does not exist, calling the function will cause an error.