Marusya's School Notes

The length Property

The real strength of JavaScript arrays are the built-in array properties and methods, such as:

  var x = cars.length;  
// The length property returns the number of elements in cars

  var y = cars.sort();  
// The sort() method sort cars in alphabetical order

The length property of an array returns the length of an array (the number of array elements):

HTML file:	Displayed by browser:
<body> <h4>The length of the fruits array is:</h4> <p id="demo"></p> <script> var fruits = [ "Banana", "Orange", "Apple", "Mango" ]; document.getElementById("demo").innerHTML = fruits.length; </script> </body>	The length of the fruits array is:

HTML file:

Displayed by browser:

<body>
<h4>The length of the fruits array is:</h4>
<p id="demo"></p>
<script>
var fruits = [
    "Banana",
    "Orange",
    "Apple",
    "Mango"
];
document.getElementById("demo").innerHTML = fruits.length;
</script>
</body>

The length of the fruits array is:

The length property is always one more than the highest array index, which is mango at [3]. More about array properties and methods later in this tutorial.