JavaScript var Statement

JavaScript Statements Reference JavaScript Statements Reference


Create a variable called carName and assign the value "Volvo" to it:

var carName = "Volvo";
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More "Try it Yourself" examples below.

Definition and Usage

The var statement declares a variable.

Variables are containers for storing information.

Creating a variable in JavaScript is called "declaring" a variable:

var carName;

After the declaration, the variable is empty (it has no value).

To assign a value to the variable, use the equal sign:

carName = "Volvo";

You can also assign a value to the variable when you declare it:

var carName = "Volvo";

For more information about variables, read our JavaScript Variables Tutorial and JavaScript Scope Tutorial.

Browser Support

var Yes Yes Yes Yes Yes


var varname = value;

Parameter Values

Parameter Description
varname Required. Specifies the name of the variable.

Variable names can contain letters, digits, underscores, and dollar signs.

  • Variable names must begin with a letter
  • Variable names can also begin with $ and _
  • Variable names are case sensitive (y and Y are different variables)
  • Reserved words (like JavaScript keywords) cannot be used as variable names
value Optional. Specifies the value to assign to the variable.

Note: A variable declared without a value will have the value undefined

Technical Details

JavaScript Version: 1.0


More Examples


Create two variables. Assign the number 5 to x, and 6 to y. Then display the result of x + y:

var x = 5;
var y = 6;
document.getElementById("demo").innerHTML = x + y;
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You can declare many variables in one statement.

Start the statement with var and separate the variables by comma:

var lastName = "Doe",
age = 30,
job = "carpenter";
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Using variables in loops:

var text = "";
var i;
for (i = 0; i < 5; i++) {
    text += "The number is " + i + "<br>";
Try it Yourself »

Related Pages

JavaScript Tutorial: JavaScript Variables

JavaScript Tutorial: JavaScript Scope

JavaScript Statements Reference JavaScript Statements Reference