Javascript For In Loop

The for..in statement iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed. In each iteration one property from object is assigned to variable and this loop continues till the end of the object.

Syntax

<script type="text/javascript">
for (variable in object) 
{
  block to execute 
}
</script>

Example

<!DOCTYPE html>
<html>  
<head>  <!-- www.techstrikers.com -->
<title>My first Javascript code</title>   
</head>  
<body bgcolor="#bnde45">
<fieldset>
<legend>Javascript For In Loop</legend>
<script> 
var obj = {a:1, b:2, c:3}; 
for (var prop in obj) {
  document.write(prop + " = " + obj[prop]);
}
</script>
</fieldset>
</body>  
</html>
Try Now

See Also

Javascript Built in String Object
Javascript Built in Number Object
Javascript Built in Math Object
Javascript Built in Date Object
Javascript Built in Arrays Object
Javascript Built in Boolean Object
Javascript Built in RegExp Object
Javascript Built in JSON Object


 
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