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The Power of Javascript: Basic Types of Data


Javascript interpreters understand two different, basic types of data: numbers and character strings. But interpreters only understand these data types when they are presented in certain ways. This article, the third in a series, will explain what these types of data are, and how to handle them.

Author Info:
By: Michael Youssef
Rating: 4 stars4 stars4 stars4 stars4 stars / 30
July 12, 2005
TABLE OF CONTENTS:
  1. · The Power of Javascript: Basic Types of Data
  2. · Data as Numbers
  3. · Boolean Data, Yes or No
  4. · One Small Change

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The Power of Javascript: Basic Types of Data - One Small Change
(Page 4 of 4 )

As you can see, the <br> tags are included inside the message boxes. Before we leave this section we will use something that is similar (in functionality) to the <br> tag that the message box will understand. Replace the code with the following:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Hello World</title>
<script language="JavaScript" type="text/javascript">
var aNumber;
alert("The variable aNumber = \n"+ aNumber);
aNumber = 123;
alert("The variable aNumber = \n"+ aNumber);
aNumber = "I'M NEW TO JAVASCRIPT";
alert("The variable aNumber = \n"+ aNumber);
</script>
</head>
<body>
</body>
</html>

Save and load the page, you will get the following three message boxes:

What we have done here is that we used the new line escape character, which the message box understands. We have placed the new line after the = sign in the string value, so the value of the variable aNumber prints at the next line. There's another thing that I would like to tell you in the following code:

aNumber = 123;
alert("The variable aNumber = \n"+ aNumber);

The first statement assigns the value 123 to the variable aNumber, and it should be familiar to you by now. The next statement concatenates the string value "The variable aNumber\n" with the number value 123, so the interpreter converts aNumber's value to a string value of "123" then concatenates it to the value:

"The variable aNumber = \n"

Then it displays the result. That's enough for now; we will talk about data type conversion in its own article.


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