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Program to reverse array in java script

<html>
<head><center><h1>to reverse array</h1></center>
<title>date function</title>
<script type="text/javascript">
a=new Array(4);
alert("enter the elements of array");
for(i=0;i<a.length;i++)
{
a[i]=parseInt(prompt("enter value"," "));
}
alert("the array is");
for(i=0;i<a.length;i++)
{
document.write("<br>"+"a["+i+"] ="+a[i]);
}
b=new Array(4);
b=a.reverse();
document.write("the reversed array is ");
for(i=0;i<b.length;i++)
{
document.write("<br>"+"b["+i+"] ="+b[i]+"<br>");
}
</script>
</head>
</html>

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