Prime or not

**insane** · 05-11-2006, 12:10 PM

This script is a slightly modified version of "Unique Random Numbers". In this script it becomes easier to implement more than one instances of "Picking Unique Random Numbers".

This JavaScript picks up a number of unique random elements from an array.

For example; if you have an array myArray consisting of 10 elements and want to pick 5 unique random elements. Suppose initially myArray[3] is picked randomly, then myArray[3] should not be picked again.

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Unique Random Numbers II</title>
<!--BEGIN HEAD SECTION CODE-->
<script language="JavaScript">
// Unique Random Numbers II
// -Picks a number of unique random numbers from an array
// By Premshree Pillai
// http://www.qiksearch.com, http://javascript.qik.cjb.net

function pickNums(nums, numArr, pickArr, count, doFlag, iterations)
{
 iterations+=1;
 var currNum = Math.round((numArr.length-1)*Math.random());
 if(count!=0)
 {
  for(var i=0; i<pickArr.length; i++)
  {
   if(numArr[currNum]==pickArr[i])
   {
    doFlag=true;
    break;
   }
  }
 }
 if(!doFlag)
 {
  pickArr[count]=numArr[currNum];
  document.write('<b>' + numArr[currNum] + '</b> <font color="#808080">|</font> ');
  /* Modify above line for a different format output */
  count+=1;
 }
 if(iterations<(numArr.length*3)) // Compare for max iterations you want
 {
  if((count<nums))
  {
   pickNums(nums, numArr, pickArr, count, doFlag, iterations);
  }
 }
 else
 {
  location.reload();
 }
}
</script>
</head>
<!--END HEAD SECTION CODE-->
<body bgcolor="#FFFFFF">

<!--BEGIN BODY SECTION CODE-->
<script language="JavaScript">
var numArr1 = new Array("0","1","2","3","4","5","6","7","8","9"); // Add elements here
var pickArr1 = new Array(); // The array that will be formed
var count1=0;
var doFlag1=false;
var iterations1=0;

pickNums(5, numArr1, pickArr1, count1, doFlag1, iterations1); // Call the function, the argument is the number of elements you want to pick.
             // Here we pick 5 unique random numbers
</script>
<!--END BODY SECTION CODE-->

</body>
</html>

**cbdarts** · 05-11-2006, 09:16 PM

Originally Posted by insane

This script is a slightly modified version of "Unique Random Numbers". In this script it becomes easier to implement more than one instances of "Picking Unique Random Numbers".

This JavaScript picks up a number of unique random elements from an array.

For example; if you have an array myArray consisting of 10 elements and want to pick 5 unique random elements. Suppose initially myArray[3] is picked randomly, then myArray[3] should not be picked again.

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Unique Random Numbers II</title>
<!--BEGIN HEAD SECTION CODE-->
<script language="JavaScript">
// Unique Random Numbers II
// -Picks a number of unique random numbers from an array
// By Premshree Pillai
// http://www.qiksearch.com, http://javascript.qik.cjb.net

function pickNums(nums, numArr, pickArr, count, doFlag, iterations)
{
 iterations+=1;
 var currNum = Math.round((numArr.length-1)*Math.random());
 if(count!=0)
 {
  for(var i=0; i<pickArr.length; i++)
  {
   if(numArr[currNum]==pickArr[i])
   {
    doFlag=true;
    break;
   }
  }
 }
 if(!doFlag)
 {
  pickArr[count]=numArr[currNum];
  document.write('<b>' + numArr[currNum] + '</b> <font color="#808080">|</font> ');
  /* Modify above line for a different format output */
  count+=1;
 }
 if(iterations<(numArr.length*3)) // Compare for max iterations you want
 {
  if((count<nums))
  {
   pickNums(nums, numArr, pickArr, count, doFlag, iterations);
  }
 }
 else
 {
  location.reload();
 }
}
</script>
</head>
<!--END HEAD SECTION CODE-->
<body bgcolor="#FFFFFF">

<!--BEGIN BODY SECTION CODE-->
<script language="JavaScript">
var numArr1 = new Array("0","1","2","3","4","5","6","7","8","9"); // Add elements here
var pickArr1 = new Array(); // The array that will be formed
var count1=0;
var doFlag1=false;
var iterations1=0;

pickNums(5, numArr1, pickArr1, count1, doFlag1, iterations1); // Call the function, the argument is the number of elements you want to pick.
             // Here we pick 5 unique random numbers
</script>
<!--END BODY SECTION CODE-->

</body>
</html>

VERY interesting, thank you... Except it may have been nicer to make it a blog...

Chaitanya

**klorpet** · 06-01-2006, 04:27 AM

Cool, nice post insane.

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