Determining the intersection of two arrays.

[dune1]

I am having so much trouble with this:(

How would I write a script that compares the integer values in two 5 element arrays.

My script should work like this:

-user enters 5 integers into the first array
-user enters 5 integers into the second array
-script finds integers that the two arrays have in common and stores them in a third array
-script prints the values in the third array

I have to create a function called addCommonValue() that takes an integer and array as arguments, and adds the number to the array
-I also need a global variable that holds the current number of common integers so far, so i can track where the numbers go into the third array.

I need to put all the code in a function(example:begin() that is called with the BODY"onLoad"event.

Can some one plzzzzzzzz help. THank you so much javascript experts

[pbmods]

Heya, Dune. Welcome to TSDN!

Changed thread title to better describe the problem (did you know that threads whose titles do not follow the Posting Guidelines actually get FEWER responses?).

The experts on this site are more than happy to help you with your problems but they cannot do your assignment/program for you. You have not asked a question. Attempt the assignment/program yourself first and post questions regarding any difficulties you have or about a particular function of the code that you don't know how to achieve.

Please read the Posting Guidelines and particularly the Coursework Posting Guidlines.

Then when you are ready post a new question in this thread.

MODERATOR

[dune1]

THis is what i have so far...
am i headed in the right direction?

<script language = "javascript">
var array1 = Array(5, 1, 3, 0); // user entered array #1
var array2 = Array(8, 1, 6, 5); // user entered array #2
var array3 = Array(); // third array
 
array1 = window.prompt ("enter a number","0");
array2 = window.prompt ("enter a number","0");
array3 = window.prompt ("enter a number","0");
 
 
 
for(var i=0;i<array1.length;i++) {
for(var j=0;j<array2.length;j++) {
if(array2[j] == array1[i]) {
array3.push(array2[j]);
}
}
}
 
for(var i=0;i<array3.length;i++) {
document.writeln("Both have number "+ array3[i]);
}
</script>

[pbmods]

Heya, Dune.

Please use CODE tags when posting source code:

[CODE=javascript]
JavaScript code goes here.
[/CODE]

These lines:

array1 = window.prompt ("enter a number","0");
array2 = window.prompt ("enter a number","0");
array3 = window.prompt ("enter a number","0");
 

are probably what's causing your app not to work, because otherwise, your code looks good. You're replacing array1, array2, etc. with the results of a prompt() which will return a string ("1" / "2" / etc.) instead of an Array.

Also, these lines:

var array1 = Array(5, 1, 3, 0); // user entered array #1
var array2 = Array(8, 1, 6, 5); // user entered array #2
var array3 = Array(); // third array
 

Really should be:

var array1 = new Array(5, 1, 3, 0); // user entered array #1
var array2 = new Array(8, 1, 6, 5); // user entered array #2
var array3 = new Array(); // third array