To find the length of an array, use the JavaScript length property. JavaScript array length property returns an unsigned, 32-bit integer that specifies the number of elements in an array.
Example
You can try to run the following code to find the length of an array −
<html>
<head>
<title>JavaScript Array length Property</title>
</head>
<body>
<script>
var arr = new Array( 50, 60, 70, 80 );
document.write("arr.length is : " + arr.length);
</script>
</body>
</html>Output
arr.length is : 4