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JavaScript Array undefined

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Undefined array is a condition that occurred when a user want to print an array element more than the declared size of element that an array object hold in it.

JavaScript Array undefined

     

Undefined array is a condition that occurred when a user want to print an array element more than the declared size of element that an array object hold in it.

The Tutorial depicts an example from JavaScript Array Undefined. In this example we try to explain a code that makes you easy to understand ArrayUndefined.An array variable instantiate an array object, that hold the reference of elements indicated by array indexes[]. The for loop run and execute the script till variable i is less than array length. The document. write print the element in an array object that it hold.

In the same way, for loop execute the script and return you true till the variable i is less than array length. Incase the array length  is more than the declared variable, then document. write print the undefined array on the browser. 

JavaScriptArrayUndefined.html

<html>
  <head>
  <title>JavaScript Array undefined</title>
  <h1>JavaScript Array undefined</h1>
  <hr></hr>
  <script>
  var array=new Array();
  array[0]="Rose";
  array[1]="India";
  array[2]=".net";
  array[3]="Rohini";
 document.write("<b>"+"Array is: "+"</b>"+"<br>");
  for(i=0;i<array.length;i++){
  document.write(array[i]+"<br>");
  
  </script>
  <hr></hr>
  <script>
  document.write("<b>"+"Array Undefined is: "+"</b>"+"<br>");
  for(i=0;i<array.length;i++){
  document.write(array[5]+"<br>");
  }
  </script>
  </head>
  <body>
  </body>
</html>

Output of the program

Download source code

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Posted on: November 13, 2008

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Comments:1
PFShenanigans
July 1, 2011
A few clarifications...

I came here to understand why I was getting the JS "array is undefined" error, but wasn't entirely satisfied, as I think my error is obviously specific to my code. However, this article is helpful, provided a few clarifications are made, IMO: You use the word "till" when you actually mean "while". Your post: "In the same way, for loop execute the script and return you true WHILE the variable i is less than array length", but then will break when the variable i is EQUAL TO or greater than the length of the array. This distinction is very important for understanding lops in the context of getting a undefined array error.
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