JavaScript Quick Syntax Reference

CHAPTER 4

Arrays

An array is a data structure used for storing a collection of values. JavaScript arrays can be grouped into three kinds: numeric, associative, and multidimensional. The distinction between these arrays is only conceptual, as JavaScript considers them all to be array objects.

Numeric Arrays

Numeric arrays store each element in the array with a numeric index. An empty array can be created using the array constructor in the following way.

var a = new Array(); // empty array

To add elements to the array you can reference them one at a time by placing the element’s index inside square brackets. Assigning a value to an element automatically ...