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JavaScript constructor Property

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Definition and Usage

The constructor property is a reference to the function that created an object.

Syntax

object.constructor

Example 1

In this example we will show how to use the constructor property:

<script type="text/javascript">

var test=new Date();
if (test.constructor==Array)
{
document.write("This is an Array");
}
if (test.constructor==Boolean)
{
document.write("This is a Boolean");
}
if (test.constructor==Date)
{
document.write("This is a Date");
}
if (test.constructor==String)
{
document.write("This is a String");
}

</script>

The output of the code above will be:

This is a Date

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Example 2

In this example we will show how to use the constructor property:

<script type="text/javascript">
function employee(name,jobtitle,born)
{
this.name=name;
this.jobtitle=jobtitle;
this.born=born;
}

var fred=new employee("Fred Flintstone","Caveman",1970);

document.write(fred.constructor);

</script>

The output of the code above will be:

function employee(name, jobtitle, born)
{this.name = name; this.jobtitle = jobtitle; this.born = born;}

Try it yourself »
Math Object Reference Complete Math Object Reference

From http://www.w3schools.com (Copyright Refsnes Data)