Defining an Array in ASP

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Defining an Array in ASP

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In ASP, arrays follow the exact same form and rules as those arrays in VBScript.

You can create an array of dynamic sized array or you can create a specific size

Declaring an Fixed Size Array in ASP

ASP Code:

<%
Dim myFixedArray(3) 'Fixed size array
Dim myDynArray() 'Dynamic size array
%>

Assigning Value to an Fixed Size Array

Let's fill up our fixed size array with values.
Our fixed array is going to store the names of four famous people.
you need to know three things to assign a value to an array :
1.The name of the array that you have declared.
2.The value you want to store in to the array
3.The position in the array where you want to store the value.

You can access group of variables inside an array by specifying the position inside the array.

In the example below an array named myFixedArray has four positions: 0, 1, 2 and 3. Then assign some values to our array.

ASP Code:

<%
Dim myFixedArray(3) 'Fixed size array
myFixedArray(0) = "Albert Einstein"
myFixedArray(1) = "Mother Teresa"
myFixedArray(2) = "Bill Gates"
myFixedArray(3) = "Martin Luther King Jr."
%>

ASP Arrays are Zero Based!

If you're a good programmer you might look at that above example and think , you only allocated three elements for that array, but you assigned four values! Well, this can be done because in ASP arrays are zero based. This means when you declare fixed array of size A then you can assign values for each value from 0 through A. Below is the ASP code which is perfectly functional that will go through our array and print out the contents of each element in that array . If you are confused by this new for loop code it will be taught later.Don't worry

ASP Code:

<%
Dim myFixedArray(3) 'Fixed size array
myFixedArray(0) = "Albert Einstein"
myFixedArray(1) = "Mother Teresa"
myFixedArray(2) = "Bill Gates"
myFixedArray(3) = "Martin Luther King Jr."
For Each item In myFixedArray
Response.Write(item & "<br />")
Next
%>

O/P:

Albert Einstein Mother Teresa Bill Gates Martin Luther King Jr

ASP Dynamic Sized Arrays

When you declare the arrayx whose size can be changed at any time simply do not put a number within the parenthesis

Use the ReDim keyword when you know what size you want the array to be

Use ReDim as many times as you wish.

Use the Preserve keyword if you want to keep your data that already exists in the array .

Below is an example which uses ReDim Keywords

ASP Code:

<%
Dim myDynArray() 'Dynamic size array
ReDim myDynArray(1)
myDynArray(0) = "Albert Einstein"
myDynArray(1) = "Mother Teresa"
ReDim Preserve myDynArray(3)
myDynArray(2) = "Bill Gates"
myDynArray(3) = "Martin Luther King Jr."
For Each item In myDynArray
Response.Write(item & "<br />")
Next
%>

O/P:

Albert Einstein Mother Teresa Bill Gates Martin Luther King Jr

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Keywords: array functions, asp array dim, arrays in asp, asp array string

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