Arrays are zero-indexed lists of values. They are a handy way to store a set of related items of the same type (such as strings), though in reality, an array can include multiple types of items, including other arrays.
Example 2.26. Accessing array items by index
var myArray = [ 'hello', 'world', 'foo', 'bar' ]; console.log(myArray[3]); // logs 'bar'
Example 2.27. Testing the size of an array
var myArray = [ 'hello', 'world' ]; console.log(myArray.length); // logs 2
Example 2.28. Changing the value of an array item
var myArray = [ 'hello', 'world' ]; myArray[1] = 'changed';
While it's possible to change the value of an array item as shown in Example 2.28, “Changing the value of an array item”, it's generally not advised.
Example 2.30. Working with arrays
var myArray = [ 'h', 'e', 'l', 'l', 'o' ];
var myString = myArray.join(''); // 'hello'
var mySplit = myString.split(''); // [ 'h', 'e', 'l', 'l', 'o' ]
Copyright Rebecca Murphey, released under the Creative Commons Attribution-Share Alike 3.0 United States license.