array.splice(index, howMany, [element1][, ..., elementN]);
<html>
<head>
<title>JavaScript Array splice Method</title>
</head>
<body>
<script type="text/javascript">
var arr = ["orange", "mango", "banana", "sugar", "tea"];
var removed = arr.splice(2, 0, "water");
document.write("After adding 1: " + arr );
document.write("<br />removed is: " + removed);
removed = arr.splice(3, 1);
document.write("<br />After adding 1: " + arr );
document.write("<br />removed is: " + removed);
</script>
</body>
</html>
After adding 1: orange,mango,water,banana,sugar,tea removed is: After adding 1: orange,mango,water,sugar,tea removed is: banana
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