JavaScript For...In Statement

The for...in statement loops through the properties of an object.

Syntax


for (variable in object)
{
//code to be executed
}


Note: The code in the body of the for...in loop is executed once for each property.

Example

Looping through the properties of an object:


<script type="text/javascript">

var person={fname:"prince",lname:"thomas",age:30};

for (var property in person)
{
document.write(property + ": " + person[property] + "<br>");
}
</script>


The output will be

fname: prince
lname: thomas
age: 30