Arrays

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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.

Asimple array

				
					 var myArray = [ ’hello’, ’world’ ];

Accessing array items by index

				
					var myArray = [ ’hello’, ’world’, ’foo’, ’bar’ ];
 console.log(myArray[3]);
 // logs ’bar’

Testing the size of an array

				
					var myArray = [ ’hello’, ’world’ ];
 console.log(myArray.length);
 // logs 2

Changing the value of an array item

				
					var myArray = [ ’hello’, ’world’ ];
 myArray[1] = ’changed’;

Adding elements to an array

				
					var myArray = [ ’hello’, ’world’ ];
 myArray.push(’new’);

Working with arrays

				
					var myArray = [ ’h’, ’e’, ’l’, ’l’, ’o’ ];
 var myString = myArray.join(’’); // ’hello’
 var mySplit = myString.split(’’); // [ ’h’, ’e’, ’l’, ’l’, ’o’ ]