1. Values
Value is a piece of information that can be a number, string, Null, Boolean, Object, or a Function as listed below:
String: It is the series of characters inside double quotes (" ").
Example: "We are learning JavaScript"
Boolean: It is true or false value.
Example: false
Number: It can be any numeric value (without double or single quotes).
Example: 10.13
Null: It has no value.
Example: null
Object: Properties and methods of an object.
2. Variables
Variable is a place holder or value holder in our computer's memory for information that can changed. This place in memory has been given a name in JavaScript so that we can easily refer to it. Declaring a variable is very easy. We have to do is precede the variable name with the word var as follows:
var variablename;
Once the variable is declared, then you can initialize it with any value shown above.
Here is an example:
variablename = 145.53;
Like the given above example you can change its value to different:
variablename = 65;
We can also change the type by simply assigning a different type of value. We can make this variable a string in the program by simply assigning it one as follows:
variablename = "This is a string in javascript.";
We can initialize a variable and assign it a value at the same time.
Example :
var variablename = "This is javascript.";
You will be using this method most of the time to declare and initialize variables.
I advice that you already try out some of these variables in a simple code like this one:
<html>
<head>
<title></title>
</head>
<body>
<script language="JavaScript">
var variablename = 547;
document.write(variablename);
</script>
</body>
</html>
Now try to change the value of the variable into whatever you like:
<html>
<head>
<title>My first Script</title>
</head>
<body>
<center>
<h1>This Variable decaration and initializing example in JAVASCRIPT.</h1>
<script language="JavaScript">
var myVariable = "This is a string in javascript"; //String Type
document.write(myVariable);
document.write("<br>");
myVariable = 1234; // number Type
document.write(myVariable);
document.write("<br>");
myVariable = true; // Boolean Type
document.write(myVariable);
document.write("<br>");
var myVariable = null; // Null Type
document.write(myVariable);
document.write("<br>")
myVariable = new Date; // object Type
document.write(myVariable);
document.write("<br>");
</script>
</center>
</body>
</html>
The Symbol (//) in given program is used to make single line comment.
Value is a piece of information that can be a number, string, Null, Boolean, Object, or a Function as listed below:
String: It is the series of characters inside double quotes (" ").
Example: "We are learning JavaScript"
Boolean: It is true or false value.
Example: false
Number: It can be any numeric value (without double or single quotes).
Example: 10.13
Null: It has no value.
Example: null
Object: Properties and methods of an object.
2. Variables
Variable is a place holder or value holder in our computer's memory for information that can changed. This place in memory has been given a name in JavaScript so that we can easily refer to it. Declaring a variable is very easy. We have to do is precede the variable name with the word var as follows:
var variablename;
Once the variable is declared, then you can initialize it with any value shown above.
Here is an example:
variablename = 145.53;
Like the given above example you can change its value to different:
variablename = 65;
We can also change the type by simply assigning a different type of value. We can make this variable a string in the program by simply assigning it one as follows:
variablename = "This is a string in javascript.";
We can initialize a variable and assign it a value at the same time.
Example :
var variablename = "This is javascript.";
You will be using this method most of the time to declare and initialize variables.
I advice that you already try out some of these variables in a simple code like this one:
<html>
<head>
<title></title>
</head>
<body>
<script language="JavaScript">
var variablename = 547;
document.write(variablename);
</script>
</body>
</html>
Now try to change the value of the variable into whatever you like:
<html>
<head>
<title>My first Script</title>
</head>
<body>
<center>
<h1>This Variable decaration and initializing example in JAVASCRIPT.</h1>
<script language="JavaScript">
var myVariable = "This is a string in javascript"; //String Type
document.write(myVariable);
document.write("<br>");
myVariable = 1234; // number Type
document.write(myVariable);
document.write("<br>");
myVariable = true; // Boolean Type
document.write(myVariable);
document.write("<br>");
var myVariable = null; // Null Type
document.write(myVariable);
document.write("<br>")
myVariable = new Date; // object Type
document.write(myVariable);
document.write("<br>");
</script>
</center>
</body>
</html>
The Symbol (//) in given program is used to make single line comment.
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