Access the length of an array in JavaScript
Description
The number of items in an array is stored in the length property.
Example
The following code shows how to access the length of an array.
//creates an array with three strings
var colors = [ "A", "B", "C" ];
//creates an empty array
var names = [];
console.log(colors.length); //3
console.log("<br/>");
console.log(names.length); //0
// w ww . jav a2 s . c o m
The code above generates the following result.
length is not read-only
By setting the length property, you can remove
or add items to the end of the array.
//creates an array with three strings
var colors = ["A", "B", "C"];
colors.length = 2; //from w w w .ja v a 2 s. com
console.log(colors[2]); //Undefined
//add a color (position 99)
colors[99] = "D";
console.log(colors.length); //100
The code above generates the following result.
