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JavaScript Array

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A Java Script array is a little database holding any given type of information, and is easily accessible to you and your scripts.

A D V E R T I S E M E N T
While there exists several built-in Document Object Model (DOM) arrays (arrays which reference HTML elements such forms and images), a custom JavaScript array can also be constructed, holding any information of your choosing.



Define An Array

The Array object is used to holding a set of data or values in a single variable name.

Define an Array object with the new keyword.

var urArray=new Array()




Creating An Array

Creating an array is different than creating a variable. Because Javascript has variables and properties associated with arrays, We have to use a special function to create a new array. Every Array has a “length” property. This always contains the number of elements in the array. Since Arrays always start at zero, the length property is convenient for loops since it will always be one greater than the actual index.


Examnple:1

<script type="text/javascript">

var urArray = new Array();
urArray[0] = "Vyom";
urArray[1] = "Techno";
urArray[2] = "Soft";

document.write(urArray[0] + urArray[1] + urArray[2]);

</script>


Output
VyomTechnoSoft


Accessing Arrays in JavaScript

We can access an array element by referring to the the element's index number and name of the array .

document.write(urArray[1])


The above code displays the second element of the array named urArray




Modifying the Contents of an Array

You can modify the contents of an array by specifying a value for a given index number:

urArray[1] = "vyomtechnosoft?"




The Array object contains 10 functions.All functions are used with the array object.

  • JavaScript   join Function

  • JavaScript   concat Function

  • JavaScript   pop Function

  • JavaScript   push Function

  • JavaScript   reverse Function

  • JavaScript   shift Function

  • JavaScript   slice Function

  • JavaScript   splice Function

  • JavaScript   sort Function

  • JavaScript   unshift Function


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Keywords:javascript array length, javascript array sort, javascript array size, javascript array methods, javascript array functions, javascript image array

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