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Thursday, December 13, 2012

Single-Dimensional Arrays - JavaScript

Single-Dimensional Arrays

Single-dimensional arrays are the simplest form of arrays. These types of arrays are used to store number of items of a predefined type. All items in a single dimension array are stored in a row starting from 0 to the size of array - 1 (array-1 is because array starts from 0).

for eg:
var mycars = new Array();
mycars[0] = "Saab";
mycars[1] = "Volvo";
mycars[2] = "BMW";

Also can be written as :
var mycars = ["Saab","Volvo","BMW"];

 The above code declares and initializes an array of 3 string items, like this we can create 'N' number of items.

To Read the Array

We use for loop to read the array,

for (var i=0 ; i< mycars.length ; i++)
{
   document.write (mycars[i]);
}

Explanation :
In For loop there are 3 statements 

Statement 1 :    var i=0
Statement 2 : i< mycars.length
Statement 3 :  i++

Statement 1 is executed before the loop (the code block) starts.
Statement 2 defines the condition for running the loop (upto array length).
Statement 3 is executed each time after the loop (the code block) has been executed.

and print the each time the value.

Output will be :
Saab
Volvo
BMW

Try It Your Self : http://www.w3schools.com/js/tryit.asp?filename=tryjs_array

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