For…In Statement : Loop Through the properties of an object in JavaScript

February 1, 2025 No Comments » Hits : 400


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For…In Statement : Loop Through the properties of an object

  1. The for…in statement loops through the properties of an object.
  2. The code in the body of the for…in loop is executed once for each property.

Live Example : For..In Statement

<html>
<body>
<script type="text/javascript">
var book = {
             bname  : "Java Programming",
             author : "Pritesh Taral",
             pages  : 275
             };
var x;
for (x in book)
{
document.write(book[x] + "");
}
</script>
</body>
</html>

Output :

Java Programming Pritesh Taral 275

Explanation :

  1. We have declared object book having 3 properties.
  2. Properties are - bname,author and pages.
  3. x is declared as index variable which is used while iterating through object properties.
  4. For..In Loop will print values of all properties in a sequence in which they are declared.

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My name is Pritesh Taral. I am working in well known MNC. as Java Developer. I am part time blogger loves writing articles on C/C++. I am active on facebook using community fan page .One can Visit me @ Facebook Facebook Fan Page